Games

0 A.D. (C, C++, JavaScript, GPL-2.0, beta)
1oom (C, GPL-2.0, mature)
2006-rebotted (Java, 2-clause BSD, mature)
2006scape (Java, GPL-3.0, mature)
2009scape (Java, Kotlin, AGPL-3.0, mature)
2048 Python (Python, MIT, mature)
2048-in-terminal (C, MIT, mature)
2048 (JavaScript, Java, MIT, mature)
2H4U (C++, GPL-2.0, mature, inactive since 2007)
3D Pong (C, GPL-2.0, beta, inactive since 2004)
3d.city (JavaScript, GPL-3.0, mature, inactive since 2016)
3Dc (C, GPL-2.0, mature, inactive since 2000)
3DWorld (C++, GPL-3.0, mature)
4D Maze Game (Java, Public domain, mature, inactive since 2008)
4D-TRIS (C, GPL-2.0, mature, inactive since 2012)
54321 (C++, Custom, mature, inactive since 2001)
A Planet's Revenge (Python, GPL-3.0, beta, inactive since 2008)
A7Xpg (D, 2-clause BSD, beta, inactive since 2005)
Abe's Amazing Adventure (C, GPL-2.0, mature, inactive since 2005)
Abuse 1996 (C++, Lisp, Custom, Public domain, GPL-2.0, WTFPL, mature, inactive since 2016)
Abuse (C++, Lisp, Public domain, GPL-2.0, WTFPL, mature, inactive since 2011)
Achtung, die Kurve! (JavaScript, AGPL-3.0, mature)
ACM (C, GPL-2.0, mature, inactive since 2000)
AdaDoom3 (Ada, GPL-3.0, beta)
AdaGate (Ada, GPL-3.0, mature)
Adanaxis (C++, GPL-2.0, mature, inactive since 2007)
AdaVenture (Ada, GPL-3.0, mature)
Advanced Strategic Command (C++, GPL-2.0, mature)
adventure engine (Lua, MIT, mature, inactive since 2013)
Afternoon Stalker (C++, GPL-2.0, mature, inactive since 2012)
AI Wars (Python, MIT, beta, inactive since 2010)
Airstrike (C, GPL-2.0, beta, inactive since 2014)
Aisleriot (C, Scheme, GPL-3.0, mature)
Ajax3d (JavaScript, GPL-2.0, beta, inactive since 2007)
Aklabeth (C, GPL-2.0, mature, inactive since 2004)
Aleph One (C++, Lua, GPL-3.0, mature)
Alex the Allegator 4 (C, GPL-2.0, mature, inactive since 2003)
Alien Assault Traders (PHP, GPL-2.0, beta, inactive since 2009)
Alimer (C++, MIT, beta)
Allure of the Stars (Haskell, AGPL-3.0, beta)
Ambermoon.net (C#, GPL-3.0, mature)
Ambrose3D (C++, zlib, beta, inactive since 2007)
Amphetamine (C, GPL-2.0, beta, inactive since 2008)
Anagramarama (C, GPL-2.0, beta, inactive since 2002)
Anarch (C, C++, CC0, mature)
Ancient Beast (JavaScript, AGPL-3.0, mature)
AndEngine (Java, Apache-2.0, mature, inactive since 2013)
Andor's Trail (Java, GPL-2.0, beta)
android-chess (Java, C++, MIT, mature)
Angband (C, GPL-2.0, mature)
Angry Birds in Python (Python, MIT, mature, inactive since 2017)
AnKi 3D engine (C++, 3-clause BSD, beta)
Annex: Conquer the World (Lua, GPL-3.0, mature, inactive since 2014)
Antares (C++, LGPL-3.0, beta)
Anteform (Lua, GPL-3.0, beta)
AntiChess (Java, MIT, beta, inactive since 2003)
antiyoy (Java, GPL-3.0, beta)
Anura (C, C++, zlib, mature)
Anuto (Java, GPL-2.0, mature)
Apple Flinger (Java, GPL-3.0, mature)
Apricots (C++, GPL-2.0, beta, inactive since 2003)
aquastax (JavaScript, MIT, beta)
Arashi-JS (JavaScript, GPL-2.0, beta, inactive since 2010)
Arcane-Engine (C++, MIT, beta)
Ardentryst (Python, GPL-3.0, mature, inactive since 2009)
Ares Dogfighter (Java, GPL-3.0, beta, inactive since 2016)
Argentum Online (Visual Basic, GPL-2.0, AGPL-3.0, beta, inactive since 2014)
Armagetron Advanced (C++, GPL-2.0, mature)
Armies (C++, GPL-3.0, mature, inactive since 2007)
Armor Alley (JavaScript, CC-BY-NC-3.0, beta)
Arrakis (Basic, Custom, mature, inactive since 2000)
Artillery Duel Reloaded (Python, GPL-3.0, beta, inactive since 2012)
Arx Libertatis (C++, GPL-3.0, mature)
asdf (JavaScript, MIT, mature)
AssaultCube (C, C++, Custom, mature, inactive since 2018)
AstroMenace (C++, C, GPL-3.0, mature)
ativayeban (C, C++, GPL-2.0, mature, inactive since 2015)
Atomic Tanks (C++, C, GPL-2.0, mature, inactive since 2016)
Atomiks (C, Objective-C, GPL-3.0, mature, inactive since 2015)
Atomix (C, GPL-2.0, mature)
Atrinik (C, Python, GPL-2.0, mature, inactive since 2016)
Attal: Lords of doom (C++, GPL-2.0, mature, inactive since 2008)
Augustus (C, C++, AGPL-3.0, mature)
Aussenposten (JavaScript, MIT, beta, inactive since 2015)
Avanor (C++, Lua, C, GPL-2.0, beta, inactive since 2008)
Awkaster (AWK, MIT, mature, inactive since 2017)
Azimuth (C, GPL-3.0, mature)
BAB BE U (Lua, MIT, mature)
back-to-nature-c64-remake (Java, MIT, mature, inactive since 2015)
Backbone Game Engine (JavaScript, MIT, beta, inactive since 2016)
Bacon2D (C++, MIT, beta, inactive since 2018)
Balder2D (C++, GPL-2.0, beta, inactive since 2009)
Ball and Paddle (C++, Scheme, Script, GPL-3.0, beta, inactive since 2009)
Ball And Wall (JavaScript, MIT, mature, inactive since 2015)
Ballerburg SDL (C, GPL-3.0, mature)
Banania (JavaScript, MIT, mature)
Barbarian (Basic, ?, mature, inactive since 2014)
Barony (C++, GPL-3.0, mature)
Bastet (C++, GPL-2.0, beta, inactive since 2018)
Batalla Naval (C, Script, GPL-2.0, mature, inactive since 2002)
Batrachians (C++, GPL-2.0, beta, inactive since 2012)
Battery (Java, EPL-2.0, Custom, mature, inactive since 2009)
Battle City (C, C++, Pascal, GPL-3.0, mature, inactive since 2013)
Battle Tanks (C++, GPL-2.0, mature, inactive since 2009)
Battlefield Java (Java, GPL-3.0, beta, inactive since 2011)
Battleround (Java, Apache-2.0, beta, inactive since 2015)
Battles of Antargis (C, C++, GPL-2.0, beta, inactive since 2014)
Beat Feet (Kotlin, GPL-3.0, mature)
Beat Harvester (Python, GPL-2.0, beta, inactive since 2009)
Belote (Java, GPL-3.0, beta)
Bemuse (JavaScript, TypeScript, AGPL-3.0, mature)
Berusky II (C++, GPL-3.0, beta)
Berusky (C++, GPL-3.0, mature)
Betrayer's Moon Tactics (JavaScript, GPL-2.0, beta, inactive since 2006)
BetterSpades (C, GPL-3.0, beta)
Between (PHP, C++, ?, beta, inactive since 2010)
Beyond All Reason (Lua, GPL-2.0, beta)
Billiards (Lua, Objective-C, GPL-3.0, beta, inactive since 2012)
Biniax (C, zlib, mature, inactive since 2012)
Biogenesis (Java, GPL-2.0, beta)
Birth of the Empires (C++, Custom, mature, inactive since 2016)
Bitfighter (C, C++, GPL-2.0, mature)
BitRiot (C++, Apache-2.0, beta, inactive since 2017)
Black Shades Elite (C, C++, GPL-2.0, beta, inactive since 2007)
Black Shades (C, GPL-3.0, mature)
BlackNova Traders (PHP, JavaScript, GPL-2.0, beta, inactive since 2012)
Blackvoxel (C++, GPL-3.0, mature)
Bladecoder Adventure Engine (Java, Apache-2.0, mature)
BlakedAwesomenaughts (JavaScript, PHP, MIT, beta, inactive since 2015)
Blasphemer (None, Python, None, mature, inactive since 2017)
Blinken (C++, GPL-2.0, mature)
Blitwizard (C, C++, Lua, zlib, beta, inactive since 2015)
Blitzkrieg (Java, GPL-3.0, beta, inactive since 2012)
Blob Wars : Attrition (C, C++, GPL-3.0, mature)
Blob Wars Episode 2 : Blob And Conquer (C++, GPL-2.0, mature, inactive since 2016)
Blobby Volley 2 (C++, GPL-2.0, mature, inactive since 2017)
Bloboats (C++, GPL-2.0, mature, inactive since 2006)
Blobwars: Metal Blob Solid (C++, C, GPL-2.0, mature)
Block Attack - Rise of the Blocks (C++, GPL-2.0, mature)
Block Puzzle Stone Wars (Java, MIT, mature)
BlockOut II (C++, GPL-2.0, mature, inactive since 2014)
Bloodmasters (C#, GPL-2.0, mature, inactive since 2008)
boardgame.io (JavaScript, TypeScript, MIT, beta)
BobBall (Java, 2-clause BSD, mature, inactive since 2017)
Bobby (TypeScript, AGPL-3.0, mature)
BomberClone (C, GPL-2.0, beta, inactive since 2010)
Bombermaaan (C++, GPL-3.0, mature, inactive since 2010)
Bombic2 (C++, GPL-2.0, beta, inactive since 2010)
Bombic (C++, Objective-C, GPL-2.0, beta, inactive since 2005)
Bombman (Python, CC0, mature)
Boohu (Go, ISC, beta)
BOOM: Remake (C++, Custom, mature)
Bos Wars (C++, GPL-2.0, mature, inactive since 2013)
Boson (C++, C, GPL-2.0, beta, inactive since 2006)
Boulder Dash (Java, MIT, mature, inactive since 2015)
Bouncy the Hungry Rabbit (Python, GPL-2.0, mature, inactive since 2007)
Brain Workshop (Python, GPL-2.0, mature, inactive since 2011)
brainblast (C++, C, GPL-3.0, beta, inactive since 2018)
bratwurst (Lisp, GPL-2.0, mature, inactive since 2009)
Breakout-VR (C#, MIT, beta, inactive since 2017)
Bridge Command (C++, GPL-2.0, mature)
Brikx (C++, GPL-2.0, beta, inactive since 2009)
Briquolo (C++, GPL-2.0, mature, inactive since 2008)
British Bingo (JavaScript, GPL-3.0, mature)
Brogue (C, AGPL-3.0, mature)
BrowserQuest (JavaScript, MPL-2.0, mature)
Brutal Chess (C++, GPL-2.0, beta, inactive since 2007)
BStone (C++, GPL-2.0, mature)
buggyGame (Python, GPL-2.0, beta, inactive since 2007)
BurgerSpace (C++, GPL-2.0, mature, inactive since 2013)
Bygfoot (Java, GPL-2.0, beta)
BZFlag (C++, LGPL-2.1, MPL-2.0, mature)
C-Dogs SDL (C, GPL-2.0, mature)
C-evo (Pascal, Public domain, GPL-3.0, mature, inactive since 2013)
C3DE (C#, MIT, beta)
c64-nuclearreaction (C, Assembly, GPL-3.0, mature, inactive since 2014)
Cabbages and Kings (Python, MIT, mature)
Cadaver (C++, GPL-2.0, beta, inactive since 2009)
CaesarIA (C++, JavaScript, C, GPL-3.0, beta)
Cafu Engine (C++, MIT, beta, inactive since 2018)
Candle (C, MIT, beta)
Candy Box 2 (TypeScript, JavaScript, GPL-3.0, mature, inactive since 2013)
Candy Memory (Java, GPL-2.0, mature, inactive since 2018)
Cannon Smash (C++, GPL-2.0, beta, inactive since 2003)
Cannonball (C++, MAME, beta)
Canta (Python, GPL-3.0, beta, inactive since 2011)
canvas-tetris (JavaScript, MIT, mature, inactive since 2018)
Caph (C, GPL-3.0, mature, inactive since 2010)
Captain Blood (C++, C, GPL-3.0, mature)
Card Stories (JavaScript, Python, AGPL-3.0, beta, inactive since 2012)
Carnage3D (C++, C, MIT, beta)
Cart Life (AGS Script, Custom, mature, inactive since 2014)
Castle of the Winds in Elm (Elm, JavaScript, MIT, beta)
Castle of the Winds (JavaScript, MIT, beta, inactive since 2016)
Castle-Combat (Python, GPL-2.0, beta, inactive since 2006)
Cat Mother Dead Justice (C++, 3-clause BSD, GPL-2.0, beta, inactive since 2003)
Cataclysm: Dark Days Ahead (C++, CC-BY-SA-3.0, mature)
Cataclysm (C++, CC-BY-SA-3.0, beta, inactive since 2012)
Catacomb 3-D (C, C++, GPL-2.0, mature, inactive since 1991)
Catacomb (Pascal, GPL-2.0, mature, inactive since 1989)
CatacombGL (C++, GPL-3.0, beta)
CatacombSDL (C, GPL-2.0, mature, inactive since 2014)
Catan Dice Game (Java, GPL-3.0, mature)
Catch Challenger (C++, C, GPL-3.0, mature)
Cattle Bity (TypeScript, MIT, mature)
CaveExpress (C, JavaScript, GPL-3.0, mature)
CavePacker (JavaScript, C, C++, Lua, GPL-3.0, mature)
CAVEZ of PHEAR (C, GPL-3.0, beta)
cc94 (C++, Python, AGPL-3.0, beta)
CCCP (C++, AGPL-3.0, beta)
Celestron (Python, GPL-3.0, beta, inactive since 2012)
CETech (C, C++, CC0, beta)
chainreaction (Java, LGPL-3.0, mature, inactive since 2017)
Chaos Esque Anthology (?, ?, mature)
Chariot (Rust, MIT, beta, inactive since 218)
Chess3D (JavaScript, Python, GPL-3.0, mature, inactive since 2016)
Children of Ur (Dart, JavaScript, MIT, beta)
Childsplay (Python, GPL-3.0, mature)
Chocolate Doom (C, GPL-2.0, mature)
Chocolate Duke3D (C, GPL-2.0, Custom, beta, inactive since 2016)
Choria (C++, C, Lua, GPL-3.0, mature)
Chroma (C, GPL-2.0, mature)
Chromium B.S.U. (C++, Artistic License-1.0, mature)
Chronoshift (C++, GPL-2.0, beta)
Chrzaszcz (C++, GPL-3.0, beta, inactive since 2018)
Chunk Stories (Kotlin, Java, LGPL-3.0, beta)
Circus Linux! (C, GPL-2.0, mature, inactive since 2000)
Citybound (Rust, JavaScript, AGPL-3.0, beta)
Civ2-clone (C#, GPL-3.0, beta)
Civil (Python, GPL-2.0, beta, inactive since 2003)
Civilization: Call To Power 2 Source Project (C, C++, Custom, mature)
Civitas (Java, Blender Script, GPL-2.0, beta, inactive since 2017)
CivOne (C#, CC0, beta)
ClanLib (C, C++, zlib, mature)
Classic Blades of Exile (C++, GPL-2.0, mature)
Classic RBDoom 3 BFG (C, C++, GPL-3.0, mature)
ClassiCube (C, 3-clause BSD, mature)
ClassicUO (C#, 4-clause BSD, beta)
Clonepoint (C++, GPL-3.0, beta)
Clumsy Bird (JavaScript, MIT, mature, inactive since 2017)
CnC Remastered Collection (C++, C#, GPL-3.0, mature, inactive since 2020)
Colditz Escape (C, GPL-3.0, mature)
Colobot: Gold Edition (C++, GPL-3.0, mature)
Colonization too (C++, GPL-2.0, beta, inactive since 2004)
Coloris (Java, GPL-3.0, mature, inactive since 2020)
Colossal Cave Adventure (Python, Apache-2.0, mature)
Columns (C++, zlib, mature)
Combat Simulator Project (C++, GPL-2.0, beta, inactive since 2010)
Command Series Engine (Go, GPL-2.0, mature)
Commander Genius (C, C++, GPL-2.0, mature)
Commander Wars (C++, JavaScript, LGPL-3.0, mature)
CommandoJS (JavaScript, CoffeeScript, MIT, beta, inactive since 2012)
CommonDrops (C++, MIT, beta, inactive since 2018)
Conquest (C++, MIT, mature)
Conquests (C++, GPL-2.0, mature, inactive since 2012)
Consomaton (TypeScript, MIT, mature, inactive since 2016)
Construo (C++, GPL-3.0, beta, inactive since 2015)
Core Breach (C, Objective-C, GPL-2.0, mature, inactive since 2012)
Core War (C, Java, GPL-2.0, 2-clause BSD, mature)
CorEngine (C, zlib, beta, inactive since 2015)
CorsixTH (Lua, C++, MIT, mature)
Cortex Command - open source (C++, C, AGPL-3.0, mature, inactive since 2019)
Cosmo-Engine (C, GPL-2.0, beta)
Cosmore (C, Assembly, MIT, mature)
Cosmosmash (C++, GPL-2.0, mature, inactive since 2013)
CoTerminalApps (Ada, GPL-3.0, mature)
Crack Attack! (C++, GPL-2.0, mature, inactive since 2005)
Craft (C, Python, MIT, mature, inactive since 2017)
CrappyBird (JavaScript, MIT, mature, inactive since 2017)
Crazy Cars (Basic, ?, mature, inactive since 2014)
Creep Smash (Java, GPL-3.0, beta, inactive since 2011)
Crimson Fields (C++, C, GPL-2.0, mature, inactive since 2010)
Critical Velocity (Java, Apache-2.0, mature, inactive since 2017)
Critterding (C++, GPL-2.0, beta, inactive since 2013)
CroftEngine (C++, Python, LGPL-3.0, beta)
Cross The Road (Elm, JavaScript, AGPL-3.0, mature)
Crossfire (C, Java, GPL-2.0, mature)
CrossUO (C, C++, GPL-3.0, mature)
Crosswords (Java, GPL-2.0, mature)
Crown and Cutlass (C++, C, Custom, beta, inactive since 2009)
Crown (C, C++, Vala, MIT, beta)
CrystalQuest (JavaScript, MIT, mature, inactive since 2017)
Cube 2: Sauerbraten (C, C++, Custom, mature, inactive since 2020)
Cube (C, C++, Custom, mature, inactive since 2005)
Cubosphere (C, C++, Lua, GPL-3.0, beta)
Cubyz (Java, GPL-3.0, beta)
Cultivation (C++, Public domain, mature, inactive since 2010)
Curse of War (C, C++, GPL-3.0, mature, inactive since 2014)
Curvytron (JavaScript, MIT, mature, inactive since 2015)
CuteMaze (C++, GPL-3.0, mature)
Cuyo (C++, OCaml, GPL-2.0, mature, inactive since 2014)
Cytadela (C++, GPL-3.0, beta, inactive since 2013)
Cytopia (C++, GPL-3.0, beta)
D2X-XL (C++, Custom, GPL-2.0, mature, inactive since 2015)
Daedalus (C++, GPL-2.0, mature, inactive since 2018)
Daggerfall Unity (C#, MIT, mature)
Daimonin (C, GPL-2.0, mature)
Danger from the Deep (C++, C, GPL-2.0, beta, inactive since 2011)
Dangerous Dave 2: Modification Edition (C++, MIT, mature)
Dark Destiny (Java, JavaScript, ?, mature, inactive since 2016)
Dark Oberon (C++, C, Objective-C, GPL-2.0, mature, inactive since 2009)
DarkCity (PHP, GPL-3.0, mature, inactive since 2012)
Darkflame Universe (C++, AGPL-3.0, mature)
DarkFO (TypeScript, JavaScript, Python, Apache-2.0, beta, inactive since 2019)
DarkPlaces (C, GPL-2.0, mature, inactive since 2014)
Data Storm (C, Apache-2.0, mature, inactive since 2017)
Dave Gnukem (C++, GPL-2.0, mature)
Dawn (C++, Lua, GPL-3.0, beta, inactive since 2011)
DDraceNetwork (C, C++, zlib, mature)
Deathchase 3D (C, Perl, Script, GPL-2.0, mature, inactive since 2002)
Deathlord Relorded (C, C++, AGPL-3.0, mature)
Decker (Java, GPL-2.0, beta, inactive since 2013)
Deer Portal (C++, zlib, beta)
Defendguin (C, GPL-2.0, mature, inactive since 2009)
Defendo (GDScript, PHP, GPL-3.0, mature, inactive since 2018)
Deflektor X4 (C, Custom, mature, inactive since 2008)
Delaford (JavaScript, PHP, MIT, beta)
Deliantra (C, Perl, C++, GPL-2.0, mature)
DelverEngine (Java, Custom, mature)
DemiGod (Java, GPL-3.0, beta, inactive since 2013)
Der Clou! (C, Custom, beta, inactive since 2017)
DesktopAdventures (C, LGPL-2.1, beta)
Destination Sol (Java, Apache-2.0, mature)
Dethrace (C, GPL-3.0, beta)
Devana (PHP, zlib, beta)
Devilution (C, C++, Unlicense, mature)
DevilutionX (C, C++, Unlicense, mature)
DGEngine (C++, zlib, GPL-3.0, beta)
dhewm3 (C, C++, GPL-3.0, mature)
Diablerie (C#, MIT, beta)
diablo-js (Java, JavaScript, MIT, mature)
Diabolika (C++, zlib, mature)
Digbuild (C, C++, GPL-2.0, beta, inactive since 2011)
Digger Remastered (C, GPL-2.0, mature, inactive since 2004)
Digital: A Love Story (Ren'Py, Python, CC-BY-NC-SA-3.0, mature)
dim3 (C, MIT, beta, inactive since 2014)
Dingo-Engine (Java, 3-clause BSD, beta, inactive since 2016)
Dink Smallwood HD (C, Custom, mature)
DirectX12GameEngine (C#, MIT, beta)
Divercity (Java, GPL-3.0, beta, inactive since 2015)
Dmomd (Lisp, GPL-3.0, mature)
DNT (C++, GPL-3.0, beta, inactive since 2016)
Do It Yourself Doom With SDL (C++, MIT, beta)
Dodge (Java, GPL-3.0, mature, inactive since 2012)
Domination (Java, GPL-3.0, mature)
Domino On Acid (Java, GPL-2.0, mature, inactive since 2009)
donut (C, C++, GPL-3.0, beta)
Doom Legacy (C++, GPL-2.0, mature)
DOOM Retro (C, C++, GPL-3.0, mature)
DOOM-iOS (C++, C, GPL-2.0, mature, inactive since 2012)
Doom64EX (C, C++, GPL-2.0, mature)
DOOM (C, Custom, mature, inactive since 2012)
Doomsday Engine (C, C++, GPL-2.0, GPL-3.0, LGPL-3.0, mature)
Dope Wars (C, GPL-2.0, mature, inactive since 2013)
doukutsu-rs (Rust, MIT, beta)
Dragon History - Dračí Historie (Pascal, Script, Pascal, Assembly, GPL-2.0, mature, inactive since 2010)
Dragon Hunt (Python, GPL-2.0, mature)
dRally (Assembly, C, MIT, beta)
DreamChess (C, GPL-3.0, beta)
DreamZZT (C, C++, GPL-2.0, beta, inactive since 2007)
Dreerally (C, C++, Custom, beta)
DRL (Lua, Pascal, GPL-2.0, mature)
DroidZebra (C, Java, GPL-3.0, mature, inactive since 2015)
Dstroy (C++, GPL-2.0, mature, inactive since 2009)
Duality (C#, MIT, mature)
Duck Hunt JS (JavaScript, MIT, mature)
Duck Marines (Lua, zlib, mature, inactive since 2016)
Duck Rehunt (Python, GPL-3.0, beta, inactive since 2011)
Duckmaze (Python, GPL-2.0, beta)
Duel Commander (C, GPL-3.0, beta, inactive since 2009)
DUGA (Python, MPL-2.0, beta, inactive since 2018)
Duke 2 Reconstructed (C, GPL-2.0, mature)
Duke3D (C, GPL-2.0, beta, inactive since 2009)
Duke3d_w32 (C, GPL-2.0, beta, inactive since 2008)
DukeGDX (Java, GPL-3.0, beta)
Dune Dynasty (C, C++, GPL-2.0, mature, inactive since 2014)
Dune II - The Maker (Java, MIT, beta, inactive since 2020)
Dune Legacy (C++, GPL-2.0, mature)
Dungeon Craft (C++, GPL-2.0, mature)
Dungeon Crawl Stone Soup (C++, Lua, GPL-2.0, mature)
Dungeon Eye (C#, GPL-3.0, beta, inactive since 2016)
Dungeon Hero (Java, MIT, mature)
Dungeon Monkey Eternal (Python, GPL-2.0, mature, inactive since 2016)
Dungeon Monkey Unlimited (Pascal, LGPL-2.1, mature, inactive since 2010)
Dungeon of Quake (Odin, Pascal, MIT, Unlicense, beta)
Dungeon Quest (Java, MIT, mature)
Dungeon (Java, 3-clause BSD, mature)
Dunnet (Emacs Lisp, GPL-3.0, mature, inactive since 1992)
Dust Racing 2D (C, C++, GPL-3.0, mature)
DwarfCorp (C#, MIT, mature)
DXX-Rebirth (C, C++, Python, GPL-3.0, Custom, mature)
DynaDungeons (GDScript, GPL-3.0, beta, inactive since 2018)
eAdventure (Java, C#, GPL-3.0, mature, inactive since 2014)
Earth 2140 on OpenRA (C#, GPL-3.0, beta)
Eat The Whistle (C, ?, mature, inactive since 2017)
Eboard (C++, GPL-2.0, mature)
Ecksdee (C++, GPL-2.0, beta, inactive since 2009)
ECWolf (C++, GPL-2.0, LGPL-2.1, zlib, MIT, IJG, Public domain, mature)
EDGE (C++, C, GPL-2.0, mature)
EDuke32 (C, C++, GPL-2.0, mature)
Egoboo (C++, C, GPL-3.0, mature, inactive since 2015)
Einstein Puzzle (C++, GPL-2.0, mature, inactive since 2005)
EliFUT Android (Java, Kotlin, Apache-2.0, mature)
Elite remake (C, 3-clause BSD, mature, inactive since 2008)
ElonaFoobar (C++, Lua, MIT, mature)
Elysium Engine (C, GPL-2.0, beta, inactive since 2006)
Emilia Pinball (C++, GPL-2.0, beta)
Empty Clip (C++, GPL-2.0, mature)
EmptyEpsilon (C, C++, Lua, GPL-2.0, mature)
Enchanted Fortress (Java, LGPL-3.0, mature)
Endgame: Singularity (Python, GPL-2.0, beta)
Endless Sky (C++, GPL-3.0, mature)
Enduro tribute (JavaScript, MIT, mature)
engge (C++, MIT, beta)
Enigma (C, C++, GPL-2.0, mature)
EnTT Pacman (C, C++, MIT, mature)
Eos, Dawn of Light: A Space Opera (Python, MIT, beta, inactive since 2007)
Epiar (C, C++, Lua, GPL-2.0, beta)
EPOH (JavaScript, MIT, beta)
erampage (C, GPL-2.0, beta, inactive since 2015)
Erebus (C++, GPL-3.0, beta)
Escape Towards The Unknown (C, GPL-2.0, beta, inactive since 2016)
Esenthel Engine (C, C++, Custom, beta)
ET: Legacy (C, C++, Lua, GPL-3.0, mature)
Eternal Lands (C, C++, Custom, mature)
EternalWinterWars (Java, MIT, beta, inactive since 2014)
Etterna (C, C++, Lua, MIT, beta)
Evil Cult (Haxe, JavaScript, GPL-3.0, mature)
Excellent Bifurcation (C, GPL-2.0, mature, inactive since 2007)
Executive Man (JavaScript, Custom, mature, inactive since 2017)
Exolon (JavaScript, MIT, mature)
Extreme Tux Racer (C++, GPL-2.0, beta, inactive since 2018)
Exult (C++, GPL-2.0, mature)
ezEngine (C++, JavaScript, MIT, mature)
ezQuake (C, C++, GPL-2.0, mature)
F-1 Spirit (C++, ?, beta, inactive since 2009)
Fairy-Max (C, Custom, mature, inactive since 2018)
Falcon's Eye (C, NetHack General Public License, mature, inactive since 2004)
Fall of Imiryn (C++, Python, GPL-3.0, beta, inactive since 2009)
Fallen Spire (Python, GPL-3.0, beta, inactive since 2009)
Falling Time (C, C++, GPL-2.0, mature)
Fallout 2 Community Edition (C++, Custom, mature)
Falltergeist (C++, GPL-3.0, beta)
Fanwor (C, GPL-2.0, mature)
FAR Colony (Pascal, GPL-3.0, beta, inactive since 2014)
Faur (C, Python, C++, GPL-3.0, beta)
Fictional Air Combat (C, C++, GPL-3.0, beta, inactive since 2012)
FIFE (C++, Python, LGPL-2.1, beta)
Fire Madness (Pascal, GPL-3.0, mature, inactive since 2016)
Fire Strike Retro (Java, Haxe, JavaScript, Ruby, PHP, MIT, mature)
First Strike (Java, MIT, mature, inactive since 2018)
Fish Fillets - Next Generation (C++, GPL-2.0, mature)
Fish Rings for Android (Java, GPL-3.0, mature, inactive since 2015)
Fitzquake (C, GPL-2.0, beta, inactive since 2009)
Flappy Cow (Java, MIT, mature)
Flex Engine (C++, MIT, beta)
FlightGear (C++, GPL-2.0, mature)
FLTK Recycling Game! (C++, LGPL-2.1, mature, inactive since 2014)
FLTrator (C++, GPL-3.0, mature, inactive since 2016)
Fluid Table Tennis (JavaScript, MIT, mature, inactive since 2013)
Flukz (C++, GPL-2.0, beta, inactive since 2014)
FOnline (C, C++, C#, GPL-3.0, beta)
FooBillard++ (C, GPL-2.0, mature, inactive since 2012)
FooBillard (C, GPL-2.0, mature, inactive since 2010)
Forge (Java, GPL-3.0, mature)
Forsaken (C, C++, GPL-2.0, Proprietary, beta, inactive since 2013)
Foursies (Elm, JavaScript, GPL-3.0, mature, inactive since 2016)
Foxy Misfortunes (Pascal, GPL-3.0, mature)
FQuake3 (F#, C, GPL-2.0, beta, inactive since 2014)
fRaBs (Lisp, C++, C, Public domain, mature, inactive since 2016)
Fractal Engine (C++, MIT, mature)
Free Allegiance (C++, MIT, mature)
Free Heroes 2 (C++, GPL-2.0, beta, inactive since 2015)
Free in the Dark (engine) (C, C++, GPL-2.0, beta)
Free Mars (Java, GPL-3.0, mature)
Free Space Colonization (C, GPL-2.0, beta, inactive since 2017)
Free Tennis (OCaml, GPL-2.0, beta, inactive since 2005)
freeablo (C++, GPL-3.0, beta)
freeaoe (C++, GPL-3.0, beta)
FreeBlocks (C, Java, GPL-3.0, beta, inactive since 2015)
Freebloks 3D for Android (Kotlin, C++, GPL-2.0, mature)
Freeciv Alpha Centauri project (C, GPL-2.0, beta, inactive since 2003)
Freeciv-web (JavaScript, Java, Python, AGPL-3.0, mature)
Freeciv (C, GPL-2.0, mature)
FreeCol (Java, GPL-2.0, mature)
FreeCS (QuakeC, GPL-2.0, mature)
Freedoom (None, Python, None, beta)
FreedroidRPG (C, C++, Lua, GPL-2.0, mature)
FrEee (C#, CC-BY-NC-SA-2.0, beta)
FreeFalcon (C, C++, 2-clause BSD, inactive since 2014)
FreeGemas (C++, GPL-2.0, mature)
freegish (C, GPL-2.0, beta, inactive since 2017)
FreeHeroes (C++, MIT, beta)
FreeHL (C, C++, ISC, beta)
Freekick 3 (C++, Python, GPL-3.0, mature, inactive since 2015)
FreeLords (Java, GPL-2.0, beta, inactive since 2017)
Freeminer (C++, Lua, GPL-3.0, beta)
Freenukum (C, GPL-3.0, beta, inactive since 2009)
FreeOrion (C++, Python, GPL-2.0, beta)
FreePrince (C, GPL-2.0, beta, inactive since 2011)
FreeRails (Java, C++, GPL-2.0, beta, inactive since 2008)
FreeRCT (C++, GPL-2.0, beta, inactive since 2016)
Freeserf.net (C#, GPL-3.0, mature)
Freeserf (C, C++, GPL-3.0, mature)
FreeSiege (C++, GPL-3.0, beta)
FreeSims (C#, MPL-2.0, beta)
FreeSO (C#, MPL-2.0, beta)
FreeSpace 2 Source Code Project (C, C++, Unlicense, mature)
Freestars (C++, GPL-2.0, beta, inactive since 2008)
FreeSynd (C++, GPL-2.0, beta, inactive since 2017)
FreeTrain (C#, C++, LGPL-2.1, beta, inactive since 2009)
freeVikings (Ruby, GPL-2.0, beta)
Frets on Fire X (Python, GPL-2.0, mature)
Frets on Fire (Python, GPL-2.0, mature, inactive since 2008)
Freya Game Engine (Java, LGPL-2.1, beta, inactive since 2002)
Friking Shark (C++, C, GPL-3.0, mature)
Froggix (Python, GPL-3.0, beta, inactive since 2009)
Frozen Bubble (Perl, C++, GPL-2.0, mature, inactive since 2012)
FTEQW (C, GPL-2.0, mature)
Fujo (Python, CC-BY-SA-4.0, mature, inactive since 2014)
FunLabyrinthe (Pascal, GPL-2.0, mature, inactive since 2012)
Fusee (C#, Python, MIT, beta)
Future Cop: MIT (C++, C, MIT, beta)
Galaxy Forces V2 (C++, Public domain, mature)
GalaxyMage Redux (Python, GPL-2.0, beta, inactive since 2011)
GalaxyNG (C, PHP, Script, GPL-2.0, mature, inactive since 2005)
GameCake (C, C++, Lua, MIT, mature)
gamekit (C++, C, zlib, mature, inactive since 2015)
GameLV (C++, GPL-2.0, beta)
GamePlay (C++, C, Apache-2.0, mature, inactive since 2016)
Gang Garrison 2 (Game Maker Script, MPL-2.0, mature)
Garith (C++, Perl, LGPL-2.1, mature, inactive since 2013)
GCompris (C, Python, GPL-3.0, mature)
GDash (C++, MIT, beta)
GDHexGrid (GDScript, MIT, mature)
GearHead 2 (Pascal, LGPL-2.0, beta)
GearHead (Pascal, LGPL-2.1, Apache-2.0, mature)
Gee Whiz (C, Script, GPL-2.0, beta, inactive since 2004)
Gem Drop X (C, GPL-2.0, beta, inactive since 2002)
ges-code (C, C++, GPL-3.0, mature)
Ghostly (C++, GPL-3.0, mature, inactive since 2016)
Gift Grabber (JavaScript, Apache-2.0, mature)
Gigalomania (C++, GPL-2.0, mature)
Gilbert and the doors (C, GPL-3.0, mature, inactive since 2018)
Gish (C, GPL-2.0, mature, inactive since 2010)
gist-txt (JavaScript, MIT, mature, inactive since 2018)
GJID (C++, MIT, mature, inactive since 2017)
GL TRON (Java, GPL-3.0, mature, inactive since 2012)
GL-117 (C++, GPL-2.0, mature, inactive since 2005)
Glest (C++, Script, GPL-2.0, mature, inactive since 2009)
GLKeeper (GrimLands Keeper) (C++, MIT, beta, inactive since 2020)
Globulation 2 (C++, GPL-3.0, mature)
Gloomy Dungeons 2 (Java, MIT, mature)
Gloomy Dungeons (Java, MIT, mature, inactive since 2018)
glParchis (Python, GPL-3.0, mature)
glPortal (C++, zlib, beta)
GLSpeed (Pascal, C, GPL-2.0, mature)
GLtron (C, ?, beta, inactive since 2017)
GLXY (Java, Apache-2.0, mature)
Gnome Chess (Vala, GPL-3.0, mature)
Gnome Hearts (Python, GPL-2.0, mature, inactive since 2015)
Gnomescroll (C, C++, Python, GPL-3.0, beta, inactive since 2013)
GNU Chess (C++, GPL-3.0, mature, inactive since 2017)
GNU FreeDink (C, GPL-3.0, mature, inactive since 2012)
GNU Go (C, GPL-3.0, mature, inactive since 2011)
GNU Shogi (C, GPL-3.0, mature, inactive since 2018)
Go Ollie! (?, GPL-3.0, mature, inactive since 2011)
Goblin Camp (C++, Python, GPL-3.0, beta, inactive since 2012)
Goblin Hack (C++, GPL-2.0, beta, inactive since 2009)
Godot Card Game Framework (GDScript, AGPL-3.0, mature)
Gods Deluxe (Java, MIT, mature, inactive since 2020)
GoldenEye: Source (C++, C, GPL-3.0, mature, inactive since 2018)
Golly (C++, Java, GPL-2.0, mature)
Gorc (C++, Apache-2.0, beta)
Gorillas-rs (Rust, MIT, beta)
Gorillas (Objective-C, JavaScript, Java Research License, mature, inactive since 2014)
Gottet (C++, GPL-3.0, mature)
GPL Arcade Volleyball (C++, GPL-2.0, beta, inactive since 2006)
Grail (C++, Lua, GPL-3.0, beta, inactive since 2013)
Granatier (C++, GPL-2.0, mature)
Gravitation (C++, Public domain, mature, inactive since 2008)
Gravity Defied (Java, GPL-2.0, mature, inactive since 2015)
Greenius' Civil War (C++, C, GPL-2.0, beta, inactive since 2001)
Griefly (C++, Go, Python, MIT, beta)
Grimsonland (JavaScript, TypeScript, MIT, mature, inactive since 2017)
Grobots (C++, GPL-2.0, mature, inactive since 2014)
gta2net (C#, MIT, beta, inactive since 2017)
GUSANOS (C++, GPL-2.0, beta, inactive since 2006)
Gusty's Serpents (C++, GPL-3.0, beta, inactive since 2014)
Gweled (C, Script, GPL-2.0, mature)
GZDoom (C, C++, GPL-3.0, mature)
H-Craft Championship (C++, C, zlib, mature, inactive since 2015)
Hack (C, 3-clause BSD, mature, inactive since 1985)
Hale (Java, GPL-2.0, beta, inactive since 2014)
Hammer of Thyrion (C, GPL-2.0, mature)
Hardwar (C++, GPL-3.0, beta, inactive since 2015)
Harmonist: Dayoriah Clan Infiltration (Go, ISC, beta)
Harris (C, Python, GPL-3.0, beta)
Harvest Moon 2.0 (GDScript, MIT, beta, inactive since 2020)
Hase (C, GPL-3.0, beta)
Haxima (C++, GPL-3.0, beta)
Head over Heels (C++, GPL-3.0, mature)
Heart of the Alien (C, GPL-2.0, beta, inactive since 2005)
Hedgewars (Lua, C, C++, Pascal, Haskell, GPL-2.0, mature)
Help Hannah's Horse (C++, GPL-2.0, beta, inactive since 2008)
Hematite (Rust, MIT, beta)
Hero of Allacrost (C++, Lua, GPL-2.0, mature)
Heroes of Civilizations (C++, C#, GPL-2.0, beta)
Heroes of Wesnoth (C++, GPL-3.0, beta, inactive since 2010)
Heroes of Wing Commander (Python, GPL-3.0, beta, inactive since 2014)
Heroine Dusk (JavaScript, GPL-3.0, mature, inactive since 2017)
Hex Game (C++, MIT, beta)
Hex-a-hop (C++, GPL-2.0, mature, inactive since 2013)
HexGL (JavaScript, CoffeeScript, MIT, mature, inactive since 2016)
heXon (C++, GPL-2.0, beta)
Hexoshi (Python, GPL-3.0, beta, inactive since 2016)
Hextris (JavaScript, GPL-3.0, mature)
Hexwar (Ruby, JavaScript, MIT, beta, inactive since 2012)
HGE (C, Haskell, zlib, beta, inactive since 2013)
HHexen (C, GPL-2.0, mature, inactive since 2013)
Hnefatafl (C, ISC, beta, inactive since 2014)
Hocoslamfy (C, C++, GPL-2.0, beta, inactive since 2016)
HoDoKu (Java, GPL-3.0, mature, inactive since 2013)
Holtz (C++, GPL-2.0, mature)
HolySpirit (C++, Haskell, GPL-3.0, beta, inactive since 2013)
Honey Town (C#, GPL-3.0, beta, inactive since 2020)
Hopson-Arcade (C++, GPL-3.0, mature)
HoverRace (C++, Custom, mature, inactive since 2016)
Hovertank 3D (C++, Assembly, GPL-2.0, mature, inactive since 2014)
HTML5 Pacman (JavaScript, WTFPL, mature, inactive since 2013)
Hurrican (C++, MIT, mature)
Hypatia (Python, MIT, beta, inactive since 2016)
Hypercube (Java, GPL-2.0, mature, inactive since 2016)
HyperRogue (C++, GPL-2.0, mature)
I Have No Tomatoes (C++, zlib, mature, inactive since 2004)
ICBM3D (C, ?, beta, inactive since 1998)
Ice Breaker (C, GPL-2.0, mature, inactive since 2003)
Iceball (C, Lua, GPL-3.0, inactive since 2017)
iiChantra (C++, MIT, beta, inactive since 2012)
ika (C++, Python, PHP, C#, GPL-2.0, beta, inactive since 2007)
Ilarion (C++, Java, Lua, GPL-3.0, mature)
Illarion (C++, Java, Lua, AGPL-3.0, GPL-3.0, mature)
IMaze (C, 4-clause BSD, mature, inactive since 2001)
Imperium (?, ?, mature)
Inertia Blast (C, GPL-2.0, mature)
Inexor (C++, JavaScript, zlib, beta, inactive since 2018)
Infiniminer (C#, MIT, mature, inactive since 2016)
Infinite Mario Bros (Java, 3-clause BSD, mature, inactive since 2010)
Infinite Tux (Java, GPL-3.0, Public domain, mature)
Infon Battle Arena (C, Lua, GPL-2.0, beta, inactive since 2012)
Innocence Engine (C++, GPL-3.0, beta)
INSTEAD (C, Lua, Java, MIT, mature)
Intersect (C#, MIT, GPL-2.0, beta)
Intricacy (Haskell, GPL-3.0, beta)
IO Reboot (C#, MIT, mature, inactive since 2017)
ioquake3 (C, GPL-2.0, mature)
iortcw (C, C++, GPL-3.0, mature)
Iris2 (C, C++, Lua, GPL-3.0, beta, inactive since 2017)
Ironseed (Pascal, GPL-3.0, mature, inactive since 2013)
irrlamb (C, C++, GPL-3.0, mature)
Isleward (JavaScript, AGPL-3.0, mature)
Isogenic Game Engine (JavaScript, MIT, mature)
Isolmoa (JavaScript, Java, GPL-3.0, mature, inactive since 2014)
Isometric Turn-Based Strategy (Python, MIT, beta)
Isometric-Minesweeper (Python, MIT, beta)
Iter Vehemens ad Necem (C++, GPL-2.0, beta)
Ithaka Board Game (Java, GPL-3.0, mature)
Jactorio (C++, MIT, beta)
Jagged Alliance 2 Stracciatella (C, C++, Custom, mature)
Jake2 (Java, GPL-2.0, beta, inactive since 2006)
Jamp (C++, GPL-3.0, beta, inactive since 2009)
JavaScript Graphic Adventure Maker (JavaScript, MIT, mature)
javascript-E.T. (JavaScript, Assembly, MIT, beta, inactive since 2017)
Javelin (Java, GPL-2.0, mature, inactive since 2016)
Jazz² Resurrection (C#, JavaScript, GPL-3.0, mature)
jClassicRPG (Java, LGPL-3.0, beta, inactive since 2010)
JediAcademyLinux (C++, GPL-2.0, beta, inactive since 2017)
JediOutcastLinux (C, C++, GPL-2.0, mature)
Jet-Story (Assembly, C, C++, MIT, beta)
JetPac (C#, MIT, mature, inactive since 2015)
jewelthief (Java, GPL-3.0, mature, inactive since 2016)
JFDuke3D (C, GPL-2.0, beta, inactive since 2005)
JGame (Java, 3-clause BSD, mature, inactive since 2012)
JonoF's Shadow Warrior Port (JFSW) (C, GPL-2.0, beta, inactive since 2005)
JQuest (Java, GPL-2.0, beta, inactive since 2006)
JSettlers (Java, GPL-3.0, mature)
jsFO (JavaScript, Python, Apache-2.0, beta, inactive since 2017)
JSkat (Java, GPL-3.0, Apache-2.0, beta)
JSoko (Java, GPL-3.0, mature)
Julius (C, C++, AGPL-3.0, mature)
Jump Don't Die (Java, GPL-3.0, mature)
Jump'n'Bump (C, GPL-2.0, mature, inactive since 2004)
Just another Tetris™ clone (Java, WTFPL, mature, inactive since 2017)
Kai ‘Opua (JavaScript, MIT, mature, inactive since 2013)
KaM Remake (Pascal, AGPL-3.0, mature)
Kartering (C, GPL-2.0, MIT, ISC, beta, inactive since 2015)
KAtomic (C++, GPL-2.0, mature)
Keen Dreams (C, Assembly, C++, GPL-2.0, mature, inactive since 2014)
KeeperFX (C, C++, GPL-2.0, beta)
KeeperRL (C, C++, GPL-2.0, beta)
Key Runner (C++, Script, GPL-3.0, mature, inactive since 2013)
KGoldrunner (C++, GPL-2.0, mature)
kiki the nano bot (C++, Public domain, mature, inactive since 2007)
Killer Crates (Java, MIT, beta, inactive since 2017)
Kingdoms (C++, GPL-3.0, beta, inactive since 2014)
KittenMaxit (Java, MIT, beta)
Kiwi.js (JavaScript, TypeScript, MIT, mature, inactive since 2015)
KlayGE (C++, GPL-2.0, mature)
Klooni 1010! (Java, GPL-3.0, beta)
KMines (C++, GPL-2.0, mature)
KnightOfWor (Java, GPL-3.0, beta, inactive since 2015)
Knights (C++, GPL-3.0, beta, inactive since 2014)
Kobo Deluxe (C++, GPL-2.0, beta, inactive since 2007)
Kobold's Quest 2 (Python, LGPL-3.0, beta, inactive since 2011)
Korax' Heritage (None, ?, mature)
KQ Lives (C, GPL-2.0, beta, inactive since 2011)
Krank (Python, Public domain, beta, inactive since 2008)
KRaptor (C, MIT, beta, inactive since 2004)
Kroz (Pascal, GPL-2.0, mature, inactive since 1990)
Kryftolike (Pascal, GPL-3.0, mature)
Krystal Drop (C++, GPL-2.0, beta, inactive since 2004)
KSnakeDuel (C++, GPL-2.0, mature)
Ksudoku (C++, GPL-2.0, mature)
Kuklomenos (C++, GPL-3.0, beta, inactive since 2012)
KungFoo Barracuda (C++, GPL-3.0, mature, inactive since 2016)
L'Abbaye des Morts (C, GPL-3.0, mature, inactive since 2018)
l-echo (C++, GPL-3.0, beta, inactive since 2016)
LAB3D/SDL (ktpanda) (C, Custom, mature, inactive since 2015)
LAB3D/SDL (C, Custom, mature, inactive since 2013)
Labyrinth of Worlds (C++, LGPL-3.0, beta, inactive since 2010)
ladder (Go, MIT, beta, inactive since 2016)
Ladder (Java, GPL-2.0, mature, inactive since 2005)
LambdaHack (Haskell, 3-clause BSD, beta)
LambdaRogue: The Book of Stars (Pascal, GPL-2.0, mature, inactive since 2012)
Land of Fire (Script, PHP, GPL-2.0, beta)
Laser Kombat (C++, GPL-3.0, mature)
LastTry (Java, MIT, beta, inactive since 2017)
LBA2 Remake (TypeScript, MIT, beta)
LBreakout2 (C, GPL-2.0, mature, inactive since 2010)
LBreakoutHD (C++, GPL-3.0, mature)
LegionGame (C#, GPL-3.0, beta)
Lemmings.ts (TypeScript, MIT, mature)
Lemmini (Java, Apache-2.0, beta, inactive since 2017)
LevelHead (C++, Python, GPL-3.0, mature, inactive since 2009)
Lexica (Java, GPL-3.0, mature)
LGames (C++, GPL-2.0, mature)
LGeneral (C, GPL-2.0, mature, inactive since 2017)
Liberal Crime Squad (C++, GPL-2.0, mature, inactive since 2012)
Liberation Circuit (C, GPL-3.0, mature)
Libre Pinball (GDScript, MIT, beta, inactive since 2015)
Librelancer (C, C#, MIT, beta)
LibreMines (C++, GPL-3.0, mature)
LibreQuake (Python, 3-clause BSD, beta)
Librerama (GDScript, GPL-3.0, mature)
LieroLibre (C++, 2-clause BSD, mature, inactive since 2017)
Limbs Off (C++, GPL-3.0, beta, inactive since 2013)
LimonEngine (C, C++, LGPL-3.0, beta)
LinCity-NG (C++, GPL-2.0, mature)
Lincity (C, GPL-2.0, mature, inactive since 2005)
Linley's Dungeon Crawl (C, C++, Custom, mature, inactive since 2006)
Linwarrior 3D (C++, Apache-2.0, mature, inactive since 2010)
LionEngine (Java, GPL-3.0, mature)
Lionheart Remake (Java, GPL-3.0, beta, inactive since 2018)
Lips of Suna (C, Lua, C++, GPL-3.0, beta, inactive since 2014)
Liquid War (C, Script, GPL-3.0, mature, inactive since 2015)
Liquid Wars (C++, Java, GPL-3.0, mature, inactive since 2014)
LITIENGINE (Java, MIT, beta)
Little Big Adventure 1 - Engine source code (Assembly, C, GPL-2.0, beta)
Little Big Adventure 2 - Engine source code (Assembly, C++, GPL-2.0, beta)
Lix (D, C++, CC0, beta)
LMarbles (C, GPL-2.0, beta)
Lode Runner 2020 (C++, C, Java, MIT, mature)
Lona (Java, JavaScript, GPL-3.0, mature)
Lords of the Fey (JavaScript, AGPL-3.0, beta, inactive since 2018)
LordsAWar! (C++, GPL-3.0, mature)
Lose Your Marbles (JavaScript, MIT, mature, inactive since 2014)
LOZ (C++, C#, Apache-2.0, beta)
LPairs (C++, GPL-3.0, mature, inactive since 2021)
LTris (C, GPL-2.0, mature, inactive since 2013)
lttp-phaser (TypeScript, JavaScript, MIT, beta, inactive since 2016)
Lugaru (C++, GPL-2.0, mature)
Luola (C, GPL-2.0, mature, inactive since 2005)
LZWolf (C++, 3-clause BSD, mature)
M.A.R.S. (C++, C, GPL-3.0, beta, inactive since 2016)
M.E.W.L. (C++, GPL-2.0, beta, inactive since 2015)
Machinations (C++, C, GPL-2.0, beta, inactive since 2003)
Maelstrom (C, C++, GPL-2.0, mature, inactive since 2002)
MafiaUnity (C#, Apache-2.0, beta, inactive since 2020)
Magarena (Java, Groovy, GPL-3.0, mature)
MAGE - Matthias Advanced Game Engine (C++, GPL-3.0, beta)
Magic Gardeners Tournament (Python, GPL-2.0, beta, inactive since 2007)
Magical Life (C#, MIT, beta)
Magnetar (C, C++, MIT, beta)
Mah-Jong (C, GPL-2.0, mature)
ManaPlus (C++, GPL-3.0, mature)
Manic Digger (C#, Public domain, Unlicense, mature, inactive since 2017)
Marble Madness 3d (C++, LGPL-2.1, beta, inactive since 2012)
Marble Marcher (C++, GPL-2.0, mature)
Marblez (C#, MIT, beta, inactive since 2017)
Mari0 (Lua, MIT, mature, inactive since 2012)
Mario Objects (C#, MIT, beta)
Mars, Land of No Mercy (C++, GPL-2.0, beta, inactive since 2008)
Maxit (C++, 3-clause BSD, mature, inactive since 2014)
Mazer (Pascal, GPL-3.0, beta, inactive since 2018)
mc2 (C++, GPL-3.0, beta)
Me and My Shadow (C++, GPL-3.0, beta)
Mechanized Assault & eXploration Reloaded (C++, C, GPL-2.0, beta)
MechCommander 2 Omnitech (C++, MS-PL, beta, inactive since 2013)
Mega Mario (C++, LGPL-2.1, mature, inactive since 2012)
MegaGlest (C, C++, GPL-3.0, mature)
MegaMek (Java, GPL-2.0, mature)
MekWars (Java, GPL-2.0, mature)
melonJS (JavaScript, MIT, mature)
Memory Game (Java, Apache-2.0, mature)
Mercenary Commander (Java, 3-clause BSD, beta, inactive since 2010)
Meridian 59 (C++, C, GPL-2.0, mature)
Meritous (C, C++, GPL-3.0, mature, inactive since 2008)
Metaforce (C, C++, MIT, beta)
Metal Mech (PHP, GPL-2.0, beta, inactive since 2006)
Metar Sweeper (Pascal, GPL-3.0, beta, inactive since 2015)
Mice Men: Remix (Java, LGPL-3.0, mature, inactive since 2016)
Micropolis (C++, Java, Python, GPL-3.0, mature, inactive since 2015)
micropolisJS (JavaScript, GPL-3.0, mature)
Microracers (C, C++, GPL-2.0, beta, inactive since 2005)
MicroWar 2.0 (Python, 3-clause BSD, mature, inactive since 2009)
Mighty Knight (PHP, GDScript, MIT, mature, inactive since 2018)
Mindustry (Java, GPL-3.0, mature)
MineClone 2 (Lua, GPL-3.0, beta)
MineCraft-One-Week-Challenge (C++, C, MIT, beta)
minecraft-weekend (C, MIT, beta)
Minecraft (C++, C, MIT, beta)
Mines (Vala, GPL-3.0, mature)
Minesweeper (in C) (C, 3-clause BSD, beta, inactive since 2015)
minesweeper-rs (Rust, MIT, mature)
Minesweeper.Zone (JavaScript, PHP, MIT, mature)
Minetest Game (Lua, LGPL-2.1, mature)
mini2Dx (Java, C#, Apache-2.0, mature)
Minilens (GDScript, GPL-3.0, mature, inactive since 2018)
Minima (Lua, GPL-3.0, mature)
Mininim (C, GPL-3.0, beta, inactive since 2017)
MiniPacman (Ada, GPL-3.0, mature)
Minos (Java, GPL-3.0, mature)
Mirror Magic (C, GPL-2.0, mature)
mk.js (JavaScript, MIT, beta)
Mmpong (C, GPL-3.0, beta, inactive since 2009)
Moagg2 (Java, GPL-2.0, mature, inactive since 2008)
Mocha Doom (Java, GPL-3.0, beta, inactive since 2012)
Mojotron: Robot Wars (C++, GPL-2.0, mature, inactive since 2019)
Monofoxe (C#, MIT, mature)
Monsters and Mushrooms (Python, GPL-2.0, mature, inactive since 2010)
Monsterz (Python, WTFPL, beta, inactive since 2007)
Monstrosity (Python, MIT, mature)
Monty Mole PC remake (C++, GPL-2.0, mature, inactive since 2012)
Moon-buggy (C, GPL-2.0, mature, inactive since 2006)
Moonbase Assault (Java, MIT, beta, inactive since 2019)
Mop(e)snake (Python, GPL-2.0, beta, inactive since 2009)
Morpheus Web Remake (JavaScript, TypeScript, MIT, beta)
Moubootaur Legends (C, C++, Script, GPL-3.0, beta)
movbizz (PHP, JavaScript, MIT, beta, inactive since 2015)
MoveNoid (C++, GPL-3.0, 3-clause BSD, mature, inactive since 2017)
Mpango (Java, JavaScript, GPL-2.0, beta, inactive since 2013)
Mr. Rescue (Lua, zlib, mature, inactive since 2016)
Mr.Boom (C++, C, MIT, mature)
Mrfuze (Python, LGPL-2.1, mature, inactive since 2008)
Mtp Target (C++, GPL-2.0, mature, inactive since 2008)
Murder In The Public Domain (C++, GPL-3.0, mature, inactive since 2013)
MUSoSu (Java, GPL-3.0, beta, inactive since 2008)
MxEngine (C++, 3-clause BSD, mature)
n2048 (C, 2-clause BSD, beta, inactive since 2014)
Naev (C, Lua, GPL-3.0, mature)
Nanosaur Source Port (C, CC-BY-NC-SA-4.0, mature)
NBlood (C, C++, Lua, GPL-2.0, mature)
NEO-RAW (C++, GPL-2.0, mature, inactive since 2020)
neoGFX (C++, GPL-3.0, beta)
NeoLemmix (Pascal, ?, beta)
Netacka (C, MIT, mature)
NetHack (C, Custom, mature)
NetMauMau (C++, LGPL-3.0, mature, inactive since 2015)
NetPanzer (C++, GPL-2.0, beta)
Netrek (C, Custom, mature, inactive since 2009)
NetStatsBaseball (C, Public domain, mature)
Neverball (C, C++, GPL-2.0, mature)
Nexuiz (C++, GPL-2.0, mature)
NFSIISE (C, MIT, mature)
Nighthawk (C++, C, GPL-2.0, mature, inactive since 2004)
Nikki and the Robots (Haskell, Lisp, LGPL-3.0, mature, inactive since 2012)
Nikwi (C++, GPL-2.0, beta, inactive since 2012)
Nitrosharp (C#, MIT, beta)
NLarn (C, Lua, GPL-3.0, mature)
No Gravity (C, GPL-2.0, mature, inactive since 2006)
Nodes-of-Yesod (C#, MIT, beta, inactive since 2015)
noiz2-droid (Java, 2-clause BSD, mature, inactive since 2015)
Noiz2sa (C, C++, 2-clause BSD, beta, inactive since 2004)
NorseWorld: Ragnarok (C#, GPL-3.0, beta)
Not Pacman (Lua, WTFPL, mature, inactive since 2013)
NOVA PINBALL (Lua, GPL-3.0, beta, inactive since 2017)
Nox Imperii (C, GPL-3.0, mature, inactive since 2016)
NStars! (C#, ?, beta, inactive since 2004)
NullpoMino (Java, 3-clause BSD, mature)
Numpty Physics (C++, GPL-3.0, beta, inactive since 2016)
Nuncabola (Java, GPL-2.0, beta)
Nuvie (C, C++, Lua, GPL-2.0, beta, inactive since 2018)
NXEngine-evo (C++, C, GPL-3.0, mature)
NXEngine (C, C++, GPL-3.0, mature)
nXtank (Python, C++, GPL-3.0, beta, inactive since 2010)
OceanPop (C++, MIT, mature)
Odamex (C, C++, GPL-2.0, beta)
Ogrian Carpet (C++, MIT, beta, inactive since 2018)
OGS Mahjong (C++, GPL-3.0, mature, inactive since 2016)
OldSkool Gravity Game (C++, C, GPL-3.0, mature, inactive since 2016)
Omega (JavaScript, Ruby, AGPL-3.0, beta)
Omnispeak (C, GPL-2.0, mature)
One Hour One Life (C, C++, PHP, Public domain, mature)
One is enough (Python, GPL-2.0, beta, inactive since 2008)
One Way To Go (Lua, GPL-3.0, mature, inactive since 2011)
Online Chess Club (PHP, JavaScript, GPL-2.0, mature)
ONScripter (C++, GPL-2.0, mature, inactive since 2020)
Oolite (Objective-C, C, JavaScript, GPL-2.0, mature)
Open Apocalypse (C++, MIT, beta)
Open Cube (C++, C, zlib, beta, inactive since 2017)
Open Flood (Java, MIT, mature, inactive since 2018)
Open Fodder (C, C++, GPL-3.0, mature)
Open Fortress (C++, CC-BY-NC-SA-4.0, Custom, beta)
Open Greedy (C, GPL-2.0, beta, inactive since 2017)
Open Hexagon (C++, C, AFL-3.0, mature)
Open Horizon (C++, MIT, beta)
Open Imperium Galactica (Java, LGPL-3.0, mature)
Open Jumpgate (C++, GPL-2.0, beta, inactive since 2017)
Open Kick-Off (Java, MIT, beta)
Open Legend RPG (None, Custom, mature)
Open Meridian (C, C++, GPL-2.0, mature)
Open Panzer (JavaScript, GPL-2.0, mature)
Open Quartz (C, GPL-2.0, beta, inactive since 2004)
Open Rails (C#, GPL-3.0, mature)
Open Rodent's Revenge (C++, MIT, beta, inactive since 2018)
Open RSC (Java, C++, C, Objective-C, AGPL-3.0, mature)
Open Simulator (C#, 3-clause BSD, beta)
Open Soccer Star (PHP, GPL-3.0, beta)
Open Surge (C, GPL-3.0, beta)
Open Syobon Action (C++, ?, beta, inactive since 2011)
Open Tibia (C++, GPL-2.0, beta, inactive since 2014)
Open Valley (C++, CC-BY-NC-SA-4.0, beta)
Open Yahtzee (C++, GPL-2.0, mature, inactive since 2016)
Open Zelda (C, C++, zlib, mature, inactive since 2015)
Open76 (C#, GPL-3.0, beta, inactive since 2020)
openage (C++, Python, GPL-3.0, beta)
OpenAlchemist (C++, GPL-2.0, beta, inactive since 2010)
OpenArena (Java, GPL-3.0, beta)
OpenArena (C, GPL-2.0, mature, inactive since 2012)
OpenAWE (C++, GPL-3.0, beta)
OpenBiohazard2 (Go, MIT, beta)
openblack (C, C++, GPL-3.0, beta)
OpenBlok (C++, GPL-3.0, beta)
OpenBlox (Python, Lua, GPL-3.0, beta, inactive since 2011)
OpenBOR (C, C++, 3-clause BSD, mature)
OpenBound (C#, GPL-3.0, mature)
OpenBVE (C#, Public domain, mature)
openc2e (C, C++, LGPL-2.1, beta)
OpenCity (C++, GPL-2.0, beta, inactive since 2015)
OpenClaw (C++, GPL-3.0, mature)
OpenClonk (C, C++, ISC, mature)
OpenCrystalCaves (C++, MIT, beta, inactive since 2017)
OpenD2 (C, C++, GPL-3.0, beta)
openDarkEngine (C++, GPL-2.0, beta, inactive since 2018)
opendf (C++, GPL-3.0, beta)
OpenDiablo2 (Go, GPL-3.0, mature)
OpenDominion (PHP, AGPL-3.0, beta)
openDOW (C, GPL-3.0, beta)
OpenDR (C#, GPL-3.0, beta)
OpenDrakan (C++, GPL-3.0, beta)
OpenDUNE (C, GPL-2.0, mature)
OpenDungeons (C++, GPL-3.0, beta)
OpenE2140 (C++, GPL-3.0, beta, inactive since 2020)
OpenEnroth (C++, LGPL-3.0, beta)
OpenEtG (JavaScript, MIT, beta)
OpenFire (C, MIT, beta, inactive since 2018)
OpenFly (C, GPL-2.0, beta, inactive since 2001)
OpenFNaF (C, MIT, beta)
OpenGGS (C++, GPL-2.0, beta, inactive since 2017)
OpenGL Test Drive Remake (C, C++, GPL-3.0, mature, inactive since 2015)
Openglad (C++, GPL-2.0, mature, inactive since 2004)
OpenGOAL (Lisp, C++, ISC, beta)
OpenGoo (C, C++, GPL-3.0, beta, inactive since 2016)
OpenGothic (C++, MIT, beta)
OpenGTA (C++, Custom, beta, inactive since 2007)
OpenHoMM (C++, GPL-3.0, beta, inactive since 2010)
OpenHoW (C, C++, GPL-3.0, beta)
OpenHV (C#, Lua, GPL-3.0, beta)
OpenITG (C, C++, MIT, beta, inactive since 2017)
OpenJazz (C++, GPL-2.0, beta)
OpenJK (C, C++, GPL-2.0, beta)
OpenJKDF2 (C, ISC, beta)
OpenKeeper (Java, GPL-3.0, beta)
OpenKrush (C#, GPL-3.0, beta)
OpenLara (C++, C, 2-clause BSD, mature)
OpenLiero (C++, C, Custom, mature, inactive since 2015)
OpenLieroX (C++, LGPL-2.0, mature)
OpenLoco (C++, MIT, mature)
OpenMC2 (C++, GPL-3.0, beta, inactive since 2018)
OpenMoHAA (C, C++, GPL-2.0, beta)
OpenMoM (C, C++, GPL-3.0, beta)
OpenMOO2 (Python, GPL-2.0, beta, inactive since 2011)
OpenMortal (C++, Perl, GPL-2.0, beta, inactive since 2006)
openMSX (C++, GPL-2.0, mature)
OpenMW for Android (Kotlin, Java, GPL-3.0, mature)
OpenMW (C++, GPL-3.0, mature)
OpenNefia (C#, Lua, MIT, beta)
OpenNFS (C, C++, MIT, beta)
OpenNitemare3D (C#, GPL-3.0, beta, inactive since 2021)
OpenNotrium (C++, GPL-3.0, beta)
OpenNox (C, Go, GPL-3.0, mature)
OpenOMF (C, C++, MIT, beta)
OpenRA (C#, GPL-3.0, mature)
OpenRaider (C, C++, GPL-2.0, beta, inactive since 2015)
OpenRCT2 (C++, GPL-3.0, mature)
OpenRoads (TypeScript, JavaScript, MIT, mature, inactive since 2014)
OpenRTS (Python, GPL-2.0, beta, inactive since 2006)
OpenRW (C, C++, GPL-3.0, beta)
OpenSA (C#, Lua, GPL-3.0, mature)
OpenSAGE (C#, LGPL-3.0, beta)
OpenSC2K (JavaScript, GPL-3.0, beta)
OpenSkyscraper (C++, GPL-2.0, beta)
OpenSoccer (PHP, GPL-3.0, beta)
OpenSolomonsKey (C++, Unlicense, beta)
OpenSpades (C, C++, AngelScript, GPL-3.0, beta)
OpenSR (C++, GPL-3.0, beta, inactive since 2017)
OpenSupaplex (C, GPL-3.0, mature)
OpenSWE1R (C, C++, GPL-2.0, beta)
OpenTESArena (C++, MIT, beta)
OpenTitus (C, GPL-3.0, beta, inactive since 2014)
OpenTomb (C, C++, Lua, LGPL-3.0, beta)
OpenTriad (Java, GPL-3.0, beta, inactive since 2017)
OpenTS2 (C#, MPL-2.0, beta)
OpenTTD (C++, GPL-2.0, mature)
OpenTyrian2000 (C, GPL-2.0, mature)
OpenTyrian (C, GPL-2.0, beta, inactive since 2018)
OpenVice (C#, ?, beta, inactive since 2021)
OpenVIII (C#, MIT, beta)
OpenWar (Go, C, GPL-3.0, beta, inactive since 2018)
OpenWebSoccer-Sim (PHP, LGPL-3.0, mature)
OpenXcom (C++, GPL-3.0, mature)
OpenXRay (C++, Lua, ?, mature)
OpenYandere (C#, GPL-3.0, beta, inactive since 2018)
Operation Citadel (C++, GPL-2.0, beta, inactive since 2000)
OPMon (C++, GDScript, GPL-3.0, beta)
Orbit-Hopper (C++, GPL-2.0, mature, inactive since 2019)
Orbium (JavaScript, GPL-2.0, mature, inactive since 2018)
Ordoor (Go, MIT, beta)
OREGON 77 (Fortran, ISC, mature)
Oreon Engine (Java, GPL-3.0, mature)
ORIENT (C#, Java, GPL-2.0, mature, inactive since 2009)
orona (CoffeeScript, GPL-2.0, beta, inactive since 2012)
Ostrich Riders (C++, GPL-3.0, beta)
osu! (C#, MIT, beta)
Other-Life (C, C++, Custom, beta)
Our Personal Space (Ren'Py, GPL-3.0, mature)
Outer Space (Python, GPL-2.0, beta)
Outpost HD (C++, 3-clause BSD, beta)
ouzel (C, C++, Objective-C, 2-clause BSD, beta)
Overgod (C, GPL-2.0, mature, inactive since 2005)
Overgrowth (C, C++, Apache-2.0, mature)
Oxygen Engine (C++, C, Apache-2.0, mature)
Pac Go (Go, MIT, mature)
Pacewar (Python, GPL-3.0, mature, inactive since 2017)
Pachi (C, Python, GPL-2.0, mature)
Pacman 吃豆游戏 (JavaScript, MIT, mature)
pacman-canvas (JavaScript, CC-BY-SA-4.0, mature, inactive since 2018)
Pacman (C++, Script, GPL-2.0, beta)
PainTown (C++, Java, Python, 3-clause BSD, mature)
Palapeli (C++, GPL-2.0, mature)
Panel Attack (Lua, zlib, beta)
Pang Zero (Perl, GPL-2.0, beta, inactive since 2007)
Paper Isaac (ooc, MIT, beta, inactive since 2015)
PaperCraft (Java, Apache-2.0, mature, inactive since 2018)
PARPG (Python, GPL-3.0, beta, inactive since 2012)
PARSEC47 (D, 2-clause BSD, beta, inactive since 2003)
Pasang Emas (Vala, GPL-3.0, mature)
Passage (C++, Public domain, mature, inactive since 2011)
Pathogen Warrior (C++, C, GPL-2.0, beta, inactive since 2004)
Pathological (Python, Script, GPL-2.0, beta, inactive since 2003)
Pax Britannica (Lua, C, MIT, mature)
PCExhumed (C++, Custom, beta)
Penguin Command (C, GPL-2.0, mature, inactive since 2007)
Pentagram (C++, GPL-2.0, beta, inactive since 2018)
Pentobi (C++, GPL-3.0, mature)
Peragro Tempus (C, C++, GPL-2.0, beta, inactive since 2012)
Performous (C, C++, GPL-2.0, mature)
Permafrost Engine (C, Python, GPL-3.0, mature)
Phantasy Star Rebirth (C++, GPL-3.0, beta, inactive since 2013)
phpRPG (PHP, GPL-2.0, beta, inactive since 2006)
Physics Platformer (Java, MIT, beta, inactive since 2019)
Physics Spacewar (Java, MIT, beta, inactive since 2019)
PianOli (Java, GPL-3.0, mature)
Pillows (Python, GPL-2.0, beta, inactive since 2007)
Pingus (C++, Scheme, GPL-3.0, mature)
Pink Pony (C++, GPL-3.0, mature, inactive since 2017)
Pioneer (C, C++, Lua, Apache-2.0, GPL-3.0, mature)
Pioneers (C, GPL-2.0, mature)
PipePanic (Java, JavaScript, MIT, mature, inactive since 2016)
PipeWalker (C++, GPL-3.0, beta, inactive since 2012)
Pixel Dungeon (Java, GPL-3.0, mature, inactive since 2015)
Pixel Wheels (Java, GPL-3.0, mature)
PixelLight (C, C++, MIT, mature, inactive since 2012)
Pizza Business (C++, GPL-2.0, mature, inactive since 2003)
PlaneShift (C++, GPL-2.0, mature)
Planet Conquest (Java, GPL-3.0, mature, inactive since 2017)
Planet Lander (Python, MIT, mature, inactive since 2020)
Planet Rider (GDScript, GPL-3.0, mature, inactive since 2015)
Planetary Hoppers (Java, GPL-2.0, beta, inactive since 2003)
Plasma (C++, Python, GPL-3.0, mature)
Playir (C++, Apache-2.0, mature, inactive since 2014)
Plee the Bear (Lisp, C++, Scheme, C, GPL-3.0, beta, inactive since 2017)
Point & Hit (Java, GPL-3.0, mature, inactive since 2017)
PokerTH (C++, AGPL-3.0, mature, inactive since 2017)
Poland can into Space (Java, NPOSL-3.0, mature, inactive since 2018)
Polis (Java, GPL-3.0, mature, inactive since 2016)
POSTAL 1 Open Source (C++, GPL-2.0, beta, inactive since 2018)
Potato Killer (Python, GPL-3.0, beta, inactive since 2011)
Powermanga (C, GPL-3.0, beta, inactive since 2015)
Powerslave EX (C, C++, GPL-3.0, beta, inactive since 2017)
PowerslaveGDX (Java, Custom, beta)
Powerslide remake (C++, MIT, beta)
pq2 (C++, GPL-3.0, mature)
PrBoom+ (C, GPL-2.0, mature, inactive since 2016)
Prescription Wars (ColdFusion, JavaScript, GPL-3.0, mature, inactive since 2016)
PrimeShooter (JavaScript, GPL-2.0, mature, inactive since 2010)
Primrose (C++, Public domain, mature, inactive since 2009)
Prince-Monogame (C#, GPL-2.0, beta)
Privateer - Gemini Gold (C++, GPL-2.0, mature, inactive since 2012)
progress-quest (C++, Python, MIT, mature)
Project Alexandria (Python, ?, beta, inactive since 2007)
Project Carrot (C++, MIT, beta, inactive since 2017)
Project Dollhouse (C#, MPL-2.0, beta)
Project Helena (Pascal, GPL-3.0, beta, inactive since 2018)
Project Porcupine (C#, GPL-3.0, beta, inactive since 2019)
Project-Uranium-Godot (GDScript, MIT, beta)
Project: Starfighter (C, GPL-3.0, mature)
ProQuake 4 (C, GPL-2.0, mature, inactive since 2018)
proxx (TypeScript, JavaScript, Apache-2.0, mature)
PSY PONG 3D (C, GPL-3.0, beta, inactive since 2009)
PsyDoom (C, C++, GPL-3.0, mature)
Pushover (C++, C, Lua, GPL-3.0, beta, inactive since 2018)
Puzzle Moppet (C++, WTFPL, mature)
PyBreak360 (Python, GPL-3.0, mature, inactive since 2015)
PyChess (Python, TypeScript, GPL-3.0, mature)
pycraft (C, Python, GPL-2.0, mature, inactive since 2018)
Pygame---Alien-Invasion (Python, GPL-3.0, beta, inactive since 2018)
PyKaraoke (Python, C, LGPL-2.1, beta, inactive since 2011)
Pyskool (Python, GPL-3.0, mature)
PySol (Python, GPL-2.0, mature, inactive since 2004)
Python Kye (Python, GPL-2.0, mature, inactive since 2010)
Q-Gears (C, C++, GPL-2.0, beta, inactive since 2015)
Q (Python, GPL-3.0, mature, inactive since 2013)
Qonk (C++, GPL-2.0, beta, inactive since 2008)
Quadrapassel (Vala, GPL-2.0, mature)
Quake3e (C, GPL-2.0, beta)
QuakeJS (JavaScript, MIT, mature)
QuakeSpasm (C, GPL-2.0, mature)
Quartz Engine (C++, 3-clause BSD, beta)
Quatter (C++, GPL-2.0, mature, inactive since 2018)
Quick Curver (C++, GPL-3.0, mature)
R.E.L.I.V.E. (C++, MIT, beta)
Rabbit Escape (Java, GPL-2.0, mature)
Race Into Space (C, C++, GPL-2.0, mature)
RacerJS (JavaScript, MIT, mature, inactive since 2010)
RAD (Pascal, C, GPL-2.0, mature)
Radakan (Python, Custom, beta, inactive since 2014)
RadixEngine (C++, zlib, mature)
Rails: an 18xx game system (Java, GPL-2.0, mature)
Raincat (Haskell, 3-clause BSD, mature, inactive since 2018)
ransack (Python, MIT, mature, inactive since 2016)
Raptor: Call of the Shadows (C, GPL-3.0, beta)
Raptor (C, C++, GPL-2.0, mature)
RaumBaller (Java, GPL-3.0, mature)
Raze (C++, GPL-2.0, mature)
RBDOOM-3-BFG (C, C++, GPL-3.0, mature)
re-private-eye (Python, 2-clause BSD, beta)
Reconstruction of Super ZZT (Pascal, MIT, mature)
Reconstruction of ZZT (Pascal, MIT, mature)
Recursive Runner (C++, GPL-3.0, beta, inactive since 2017)
Red Eclipse (C++, C, zlib, mature)
RedneckGDX (Java, Custom, beta)
Rednukem (C++, Custom, beta)
REDriver2 (C++, C, MIT, beta)
RedShift (C, C++, GPL-2.0, beta, inactive since 2008)
Reflection Keen (C, Lua, GPL-2.0, mature)
REGoth (C++, GPL-3.0, MIT, mature)
Reliquarium (Ada, GPL-2.0, mature)
remc2 (C, GPL-3.0, mature)
Remixed Dungeon (Java, GPL-3.0, mature)
Remnants of the Precursors (Java, CC-BY-NC-ND-4.0, mature)
reone (C++, GPL-3.0, beta)
Replica Island (Java, Apache-2.0, mature, inactive since 2011)
ReQbert (JavaScript, GPL-3.0, beta)
Rescue! Max (Java, GPL-3.0, beta, inactive since 2013)
ResidualVM (C++, GPL-2.0, beta)
Retro Stack (Kotlin, GPL-3.0, mature)
Return of Dr. Destructo (C++, MIT, mature, inactive since 2015)
Return to the Roots (C++, GPL-3.0, mature)
ReTux (Python, GPL-3.0, mature, inactive since 2018)
rfk-inform (Script, Artistic License-2.0, mature)
Ri-li (C++, GPL-3.0, mature, inactive since 2007)
RickyD (C++, GPL-2.0, beta)
Rigel Engine (C++, GPL-2.0, beta)
Rigs of Rods (C, C++, AngelScript, GPL-3.0, mature)
Riiablo (Java, Apache-2.0, beta)
Rise of the Triad for Linux (C, GPL-2.0, mature, inactive since 2012)
rlvm (C++, GPL-3.0, mature)
Robbo (JavaScript, MPL-2.0, mature, inactive since 2016)
Robot Redemption (C++, CC-BY-NC-SA-4.0, GPL-2.0, mature, inactive since 2014)
rock-raiders-remake (JavaScript, MIT, beta)
Rockbot (C++, GPL-2.0, mature)
Rocks'n'Diamonds (C, GPL-2.0, mature)
Rogue Clone IV (C, 3-clause BSD, mature, inactive since 2006)
RogueBox Adventures (Python, GPL-3.0, mature)
RogueSharp (C#, MIT, mature)
Roguish (JavaScript, 3-clause BSD, beta, inactive since 2015)
Room for Change (Java, Apache-2.0, mature, inactive since 2013)
Rot Magus (JavaScript, Apache-2.0, CC0, beta)
Roton (C#, ISC, beta, inactive since 2019)
Rott94 (C, C++, GPL-2.0, beta)
rottexpr (C, GPL-2.0, beta)
RPG-X (C, GPL-2.0, mature, inactive since 2015)
rpgboss (Scala, JavaScript, AGPL-3.0, beta, inactive since 2017)
rRootage (C, 2-clause BSD, beta, inactive since 2004)
Ruby-warrior (Ruby, MIT, beta, inactive since 2012)
RufasCube (Ada, GPL-2.0, mature)
RufasSlider (C++, GPL-2.0, mature)
RufasSwap (Ada, GPL-3.0, mature)
RuneLite (Java, 2-clause BSD, mature)
Runfield (JavaScript, GPL-3.0, mature, inactive since 2011)
RuZZT (Rust, MIT, beta)
Ryzom Core (C++, PHP, AGPL-3.0, mature)
S.C.O.U.R.G.E. (C++, GPL-2.0, beta, inactive since 2008)
SanAndreasUnity (C#, MIT, mature)
sandspiel (Rust, JavaScript, TypeScript, MIT, beta)
Sarah-Maries Eierjagd (C++, GPL-2.0, mature, inactive since 2005)
sccopter (C, C++, MIT, beta, inactive since 2019)
Scorched Moon (Python, GPL-3.0, beta)
Scorched3D (C++, GPL-2.0, mature, inactive since 2014)
Scrabble3D (Pascal, GPL-3.0, mature, inactive since 2015)
Scrap (C, C++, GPL-2.0, mature, inactive since 2017)
SCSharp (C#, MIT, beta, inactive since 2011)
SDL Asylum (C, GPL-3.0, mature, inactive since 2009)
SDL Bomber (C, GPL-2.0, mature, inactive since 2012)
SDL Sopwith (C, C++, GPL-2.0, mature, inactive since 2014)
SDL-Ball (C++, GPL-3.0, mature, inactive since 2016)
SDLPoP (C, GPL-3.0, mature)
Sea-Wolf (JavaScript, MIT, mature)
Seafood Berserker! (Java, GPL-3.0, mature, inactive since 2018)
Search for the Red Herring (Python, GPL-2.0, mature, inactive since 2006)
Secret Maryo Chronicles (C++, GPL-3.0, mature, inactive since 2009)
Sengoku: Warring States of Japan (C++, Lua, MIT, beta, inactive since 2008)
sensitive-js (JavaScript, Custom, beta, inactive since 2017)
Sentient Storage (Python, Public domain, mature)
Serious Engine (C, C++, GPL-2.0, mature, inactive since 2017)
Serious Sam Android (C, C++, GPL-2.0, mature, inactive since 2020)
Serious Sam Classic (C++, GPL-2.0, mature)
Settlers III remake (Java, MIT, beta)
Seven Kingdoms: Ancient Adversaries (C++, GPL-2.0, mature)
sfall (C++, C, GPL-3.0, mature)
sh3redux (C, C++, GPL-3.0, beta, inactive since 2019)
shadow-of-the-beast-html5 (JavaScript, Apache-2.0, beta, inactive since 2017)
Shadowgrounds (C++, Custom, beta, inactive since 2017)
SharpKonquest (C#, GPL-2.0, mature, inactive since 2007)
Shattered Pixel Dungeon (Java, GPL-3.0, mature)
Ship of Harkinian (C, C++, MIT, mature)
shiromino (C++, MIT, beta)
Shockolate (C, GPL-3.0, beta)
Shotgun Debugger (C++, GPL-2.0, mature, inactive since 2005)
Siege of Avalon : Open Source (Pascal, Custom, beta, inactive since 2011)
Signus: The Artefact Wars (C++, GPL-2.0, mature)
SilverTree (C++, GPL-3.0, beta, inactive since 2007)
Simitone (C#, MPL-2.0, beta)
Simon Tatham's Portable Puzzle Collection (C, MIT, mature)
Simple Brick Games (Java, GPL-3.0, mature, inactive since 2017)
Simple Platformer (Java, MIT, beta, inactive since 2019)
Simple Sokoban (C, Objective-C, GPL-3.0, mature, inactive since 2014)
Simple-Solitaire (Java, GPL-3.0, mature)
Simsu (C++, GPL-3.0, mature)
Simutrans (C++, Artistic License-1.0, mature)
Sinatra (C, GPL-3.0, mature, inactive since 2008)
Sine (C, C++, MIT, beta)
Sintel The Game (Python, MIT, beta, inactive since 2014)
Skifree-HTML5-clone (JavaScript, GPL-3.0, beta, inactive since 2011)
skifree.js (JavaScript, MIT, mature, inactive since 2016)
Skrupel - Tribute Compilation (PHP, JavaScript, GPL-2.0, mature, inactive since 2011)
SLASH'EM (C, C++, Custom, beta, inactive since 2007)
Slay (Java, GPL-3.0, beta, inactive since 2010)
Sleep Is Death (C++, ?, mature, inactive since 2018)
SliJewel (Pascal, GPL-3.0, mature, inactive since 2020)
SliLights (Pascal, GPL-3.0, mature, inactive since 2021)
SliLumns (Pascal, GPL-3.0, mature, inactive since 2020)
Slime Volley (C, GPL-3.0, mature, inactive since 2010)
Slime Volleyball (C++, 3-clause BSD, beta)
SliMind (Pascal, GPL-3.0, mature, inactive since 2020)
SliMine (Pascal, GPL-3.0, mature, inactive since 2020)
Slingshot (Python, GPL-2.0, beta, inactive since 2007)
SliPeg (Pascal, GPL-3.0, mature, inactive since 2020)
SliSame (Pascal, GPL-3.0, mature, inactive since 2020)
SliSnake (Pascal, GPL-3.0, mature, inactive since 2020)
SliTris (Pascal, GPL-3.0, mature, inactive since 2020)
Slot-Racers (C, C++, GPL-3.0, mature, inactive since 2008)
Sludge (C, C++, Objective-C, LGPL-2.1, mature)
Slune (Python, GPL-2.0, mature, inactive since 2007)
Smash Battle (C++, GPL-2.0, beta, inactive since 2011)
Smash (JavaScript, MIT, mature)
Smolpxl (JavaScript, AGPL-3.0, mature)
snake (Java, WTFPL, mature, inactive since 2017)
Snelps (Ruby, LGPL-2.1, beta, inactive since 2012)
Snowballz (Python, GPL-2.0, beta, inactive since 2007)
Sokoban (CoffeeScript, AGPL-3.0, mature)
SokoSolve (C#, GPL-3.0, mature, inactive since 2009)
SolarWolf (Python, LGPL-2.1, mature, inactive since 2004)
Soldank (Rust, MIT, beta)
Soldat (C, Pascal, MIT, mature)
Sole Collector (Java, MIT, beta, inactive since 2018)
Song of Albion (C, C++, Apache-2.0, mature, inactive since 2011)
Sonic Robo Blast 2 (C, C++, GPL-2.0, mature)
Sootl (Elm, JavaScript, GPL-2.0, beta, inactive since 2016)
Sopwith 3 (C, C++, Objective-C, GPL-2.0, beta, inactive since 2003)
Source of Tales (Lua, GPL-3.0, mature, inactive since 2013)
Sourcehold (C++, MIT, beta)
Space Faring (Java, GPL-3.0, beta)
Space Harrier Clone (C, C++, MIT, beta, inactive since 2018)
Space Nerds In Space (C, Lua, GPL-2.0, beta)
Space Opera (Java, GPL-2.0, beta, inactive since 2008)
Space Station 13 (DM, AGPL-3.0, mature)
Space Trader for Android (Java, GPL-3.0, mature, inactive since 2016)
Space Trader for Windows (C#, GPL-2.0, mature, inactive since 2009)
Space War (Java, Apache-2.0, mature)
SpaceCadetPinball (C++, MIT, mature)
SpacePeng! (Java, GPL-3.0, mature, inactive since 2017)
SpaceTrader for Java (Java, GPL-2.0, mature, inactive since 2010)
SpaceZero (C, GPL-3.0, beta)
Spartan Engine (C, C++, MIT, beta)
Speed Dreams (C++, GPL-2.0, mature)
Spelling Bee (JavaScript, TypeScript, MIT, mature)
Spice Trade (Java, LGPL-2.1, mature, inactive since 2005)
splexhd (C++, GPL-2.0, beta, inactive since 2012)
Spludlow Tetris (C#, GPL-3.0, mature, inactive since 2018)
Spooker Framework (C#, MIT, beta, inactive since 2014)
Spring: 1944 (Lua, GPL-2.0, CC-BY-NC-3.0, mature)
Spring (C++, C, Lua, GPL-2.0, mature)
SRB2Kart (C, C++, GPL-2.0, mature)
SS13 Remake (C#, GPL-3.0, beta, inactive since 2015)
Star Maiden Astraea Rio (Ren'Py, MIT, mature)
Star Ruler 2 (C, C++, MIT, mature)
star-control2 (C, C++, MIT, mature)
Star-Wars-III (Python, GPL-2.0, mature, inactive since 2014)
StarBlastrix (C++, GPL-2.0, beta, inactive since 2006)
Stareater (C#, GPL-3.0, beta)
Stargus (C++, Lua, GPL-2.0, beta, inactive since 2010)
StarMines: The Next Generation (Scala, GPL-3.0, mature)
Stars! Nova (C#, GPL-2.0, beta)
starshatter-open (C++, 3-clause BSD, beta, inactive since 2015)
Starun (Java, GPL-3.0, mature, inactive since 2017)
Steamer Duck (Python, CC0, beta)
Stendhal (Java, GPL-2.0, mature)
StepMania (C, C++, Lua, MIT, mature)
SteveTech1 (Java, MIT, beta, inactive since 2019)
Stockfish (C++, GPL-3.0, mature)
Stone Kingdoms (Lua, Apache-2.0, beta)
Story of a Lost Sky (Python, 3-clause BSD, mature)
Stratagus (C++, GPL-2.0, mature)
StressFreeZone (C++, Lua, GPL-3.0, beta, inactive since 2007)
Strife: Veteran Edition (C, C++, Objective-C, GPL-3.0, beta, inactive since 2016)
Stringrolled (Python, Public domain, beta, inactive since 2008)
Stunt Rally (C, C++, GPL-3.0, mature)
Sudokuki (C, Java, GPL-3.0, mature, inactive since 2016)
Summoning Wars (C, C++, Lua, GPL-3.0, beta, inactive since 2014)
SunDog Resurrection (Java, Python, Artistic License-1.0, beta)
Sundog: Frozen Legacy (C, Python, MIT, mature)
sundog (C, C++, Python, MIT, beta)
Supaxl (JavaScript, MIT, mature)
Super Bombinhas (Ruby, GPL-3.0, mature)
Super Mario Bros. X (Visual Basic, MIT, mature, inactive since 2020)
Super Methane Brothers for Wii and GameCube (C++, GPL-2.0, beta, inactive since 2018)
Super Methane Brothers (C++, GPL-2.0, mature, inactive since 2011)
Super Retro Mega Wars (Kotlin, GPL-3.0, beta)
Super Tilt Bro (Assembly, Python, WTFPL, mature)
Super Transball 2 (C++, GPL-2.0, mature, inactive since 2005)
Supercars III (Java, ?, mature, inactive since 2014)
SuperFoulEgg (Objective-C, C, MIT, mature, inactive since 2014)
SuperTux (C++, GPL-3.0, beta)
SuperTuxKart (C++, C, GPL-3.0, mature)
SuperTuxParty (GDScript, GPL-3.0, beta)
Supremacy (C#, MS-RL, beta, inactive since 2014)
Survivor (JavaScript, CC-BY-NC-3.0, mature)
Swappy Jigsaw (Pascal, GPL-3.0, mature, inactive since 2019)
SWP (C, C++, GPL-2.0, mature)
Syndicate Wars Port (C, GPL-3.0, beta, inactive since 2010)
System Syzygy (Rust, GPL-3.0, mature, inactive since 2018)
T-Bots (C, C++, GPL-2.0, beta, inactive since 2004)
T^3 (C++, GPL-2.0, beta, inactive since 2005)
Tabletop Club (GDScript, MIT, beta)
Tactics Squad (C++, GPL-2.0, beta, inactive since 2007)
Taggem (JavaScript, AGPL-3.0, beta, inactive since 2014)
Taisei Project (C, Python, MIT, mature)
Tales of Maj'Eyal (C, Lua, GPL-3.0, mature)
Tanglet (C++, GPL-3.0, mature)
Tangomon (Python, GPL-3.0, mature, inactive since 2017)
Tank: Zone of Death (C++, Lua, GPL-3.0, beta, inactive since 2017)
TankistOnline (Python, GPL-3.0, beta)
Tanks of Freedom (GDScript, MIT, mature)
Tapir (C, Ruby, Apache-2.0, MIT, beta, inactive since 2017)
Taponium (Java, GPL-3.0, mature, inactive since 2019)
Team Tactics (Java, MIT, beta, inactive since 2016)
TecnoballZ (C++, GPL-3.0, beta, inactive since 2016)
Teeworlds (C, C++, zlib, beta)
TekwarGDX (Java, Custom, beta)
Tenes Empanadas Graciela (C, JavaScript, Perl, C++, GPL-2.0, beta, inactive since 2015)
Tennix! (C, C++, GPL-2.0, mature)
TermFrogger (Ada, GPL-3.0, mature)
TerminalApps (Ada, GPL-3.0, mature)
terrarium (C++, Script, GPL-2.0, beta)
TES3MP (C++, GPL-3.0, beta)
TetraVex (Swift, GPL-3.0, beta)
Tetrepetete (C++, GPL-2.0, mature)
Tetris (in C and NCURSES) (C, 3-clause BSD, mature)
Tetzle (C++, GPL-3.0, mature)
The Battle for Wesnoth (C, C++, Java, Python, Lua, GPL-2.0, mature)
The Bub's Brothers (Python, C, MIT, mature, inactive since 2013)
The Butterfly Effect (C++, GPL-2.0, beta)
The Castles of Dr. Creep (C++, Script, GPL-3.0, mature)
The Catacomb (C, C++, GPL-2.0, mature, inactive since 1990)
The Clans (C, Objective-C, GPL-2.0, beta, inactive since 2003)
The Dark Mod (C++, GPL-3.0, mature)
The Endless Dungeons (C, CC-BY-NC-SA-2.0, mature, inactive since 2015)
The Epic of Heroes (C++, GPL-3.0, beta, inactive since 2015)
The Eternity Engine (C, C++, GPL-3.0, mature)
The Force Engine (C++, GPL-2.0, beta)
The House (JavaScript, MIT, mature, inactive since 2019)
The hunt for the lost rainbow jewels (Jewelhunt) (Java, GPL-2.0, beta)
The Knights of Alentejo (Java, C++, 2-clause BSD, beta)
The Legend of Edgar (C, GPL-2.0, mature)
The Mana World (C++, Script, GPL-2.0, mature)
The Powder Toy (C++, C, Lua, Python, GPL-3.0, mature)
The Rush (C++, GPL-2.0, beta, inactive since 2011)
The Secret Chronicles of Dr. M. (C++, GPL-3.0, mature)
The Ur-Quan Masters (C, GPL-2.0, mature, inactive since 2011)
The-Trail (Java, MIT, Apache-2.0, beta, inactive since 2018)
Theme Park Builder 3D CAD (C++, GPL-3.0, beta, inactive since 2013)
TheXTech (C++, GPL-3.0, mature)
thiefcatcher (C++, GPL-3.0, beta)
Threes-C (C, Objective-C, MIT, mature, inactive since 2015)
Threes.el (Emacs Lisp, GPL-3.0, mature)
Thrive (C++, AngelScript, JavaScript, C#, GPL-3.0, beta)
Thrust (C, GPL-2.0, beta, inactive since 2006)
Thugaim (Java, MIT, mature, inactive since 2017)
Thunder Engine (C++, Apache-2.0, beta)
Thunder&Lightning (C, C++, Io, GPL-2.0, beta, inactive since 2015)
Thyme (C, C++, GPL-2.0, beta)
TIC-80 (C, Java, C++, Lua, MIT, beta)
Tile World (C, GPL-2.0, mature, inactive since 2015)
TinTin++ (C, GPL-3.0, mature)
Tiny Tris (C, GPL-3.0, mature)
Tiny Wings (Objective-C, C, C++, MIT, beta)
Titan Tactics (GDScript, CC0, beta)
TOMB5 (C, C++, MIT, beta)
Toppler (C++, GPL-2.0, mature, inactive since 2012)
TORCS, The Open Racing Car Simulator (C++, C, PHP, GPL-2.0, mature, inactive since 2016)
Tornado (C, GPL-2.0, mature, inactive since 2009)
Torque 2D (C++, C, MIT, mature)
Torque 3D (C++, C, MIT, mature)
Torrega Race (Lua, GPL-3.0, mature, inactive since 2015)
Torso Ninja 2 (Python, GPL-3.0, mature, inactive since 2017)
Torso Ninja (Python, GPL-3.0, mature, inactive since 2017)
Total Annihilation 3D (C++, C, Lua, GPL-2.0, beta, inactive since 2017)
Tower Toppler (C++, GPL-2.0, mature, inactive since 2012)
TowerJumper (C++, GDScript, GPL-3.0, mature)
Trackballs (C++, Scheme, GPL-2.0, mature)
Train (Java, 3-clause BSD, beta)
Transcend (C++, ?, beta, inactive since 2005)
Transfusion (C, GPL-2.0, beta, inactive since 2007)
Tremfusion (C, GPL-2.0, mature, inactive since 2009)
Tremulous (C, GPL-2.0, mature, inactive since 2016)
Tressette (C++, GPL-2.0, mature, inactive since 2017)
Trigger (C++, GPL-2.0, beta)
Trinity Reign (C++, C, GPL-3.0, beta, inactive since 2013)
Trip on the Funny Boat (Python, GPL-2.0, mature, inactive since 2007)
TripleA (Java, GPL-2.0, mature)
TROPHY (C++, GPL-2.0, mature, inactive since 2012)
TrueCraft (C#, MIT, beta, inactive since 2018)
Tttris (Java, GPL-3.0, mature, inactive since 2012)
Tumbly Towers (Java, MIT, beta, inactive since 2017)
Tumiki Fighters (D, C++, 2-clause BSD, mature, inactive since 2005)
Turious (C, GPL-3.0, beta, inactive since 2014)
Turn of War (Java, GPL-3.0, beta, inactive since 2014)
Turo (PHP, GDScript, GPL-3.0, mature, inactive since 2018)
TurokEX (C++, C, GPL-2.0, beta, inactive since 2014)
TUSSLE (Python, GPL-3.0, mature, inactive since 2017)
Tux Builder (GDScript, GPL-3.0, beta)
Tux Football (C++, GPL-2.0, beta, inactive since 2012)
Tux Memory (Java, GPL-3.0, mature, inactive since 2014)
Tux of Math Command (C, GPL-3.0, mature, inactive since 2011)
Tux Paint (C, C++, GPL-2.0, beta)
Tux Racer (C, C++, GPL-2.0, beta, inactive since 2001)
Tux Rider (C, GPL-2.0, mature, inactive since 2019)
Tuxemon (Python, GPL-3.0, beta)
TuxKart (C++, GPL-2.0, beta, inactive since 2004)
TVTower (BlitzMax, Lua, Custom, mature)
twin-e (C, GPL-2.0, beta, inactive since 2015)
TwinEngine (C, GPL-2.0, mature, inactive since 2015)
Tyger (Python, ?, beta, inactive since 2016)
Tyrian Remake (Java, GPL-2.0, beta)
TyrQuake (C, GPL-2.0, beta)
UA_source (C++, GPL-2.0, beta)
UAlbion (C#, MIT, beta)
UchuServer (C#, AGPL-3.0, mature)
Uebergame (TorqueScript, C#, MIT, mature)
UFO2000 (C, C++, Lua, GPL-2.0, mature, inactive since 2012)
UFO: Alien Invasion (C, C++, GPL-2.0, mature)
Ularn (C, C++, GPL-2.0, mature, inactive since 2018)
UlDunAd (Python, GPL-3.0, beta, inactive since 2011)
Ultima 5 Redux (C#, MIT, beta)
Ultimate Stunts (C++, GPL-2.0, beta, inactive since 2013)
UltraStar Deluxe (Pascal, GPL-2.0, mature)
UltraStar Play (C#, MIT, beta)
uMario (C++, GPL-2.0, beta, inactive since 2016)
Umbra (Python, Custom, beta, inactive since 2002)
Umoria (C, C++, GPL-3.0, mature)
Unciv (Kotlin, MPL-2.0, mature)
Underworld Adventures (C++, Lua, GPL-2.0, beta)
UnderworldExporter (C#, C++, MIT, mature)
uninvited (C, C++, Artistic License-2.0, beta, inactive since 2016)
UnityPacmania (C#, Custom, mature)
unitystation (C#, AGPL-3.0, beta)
Unknown Horizons Godot Engine Port (GDScript, GPL-2.0, beta)
Unknown Horizons (Python, GPL-2.0, beta)
UnNetHack (C, Custom, mature)
Unvanquished (C, C++, GPL-3.0, mature)
UTEngine (C++, zlib, beta)
Valyria Tear (Lua, C++, C, GPL-2.0, mature)
Vamos (C++, Python, GPL-3.0, beta, inactive since 2014)
Vangers (C++, GPL-3.0, mature)
Vanilla-Conquer (C, C++, Assembly, GPL-3.0, mature)
Vault13 (Rust, GPL-3.0, beta, inactive since 2020)
VCMI (C++, GPL-2.0, mature)
VDrift (C++, GPL-3.0, mature, inactive since 2014)
Vector Pinball (Java, GPL-3.0, mature)
Vectoroids (C, GPL-2.0, mature, inactive since 2002)
Vegan on a Desert Island (Lua, GPL-3.0, beta)
Veloren (Rust, GPL-3.0, beta)
Venzone (Haskell, GPL-3.0, mature)
Veraball (GDScript, MIT, beta, inactive since 2016)
Vertigo (C, GPL-2.0, beta, inactive since 2002)
Violetland (C++, GPL-3.0, beta)
Vircadia (C++, Apache-2.0, mature)
Virus Attack (Java, AGPL-3.0, mature)
Visual Pinball (C++, MAME, mature)
vitetris (C, 2-clause BSD, beta)
vkQuake (C, C++, GPL-2.0, mature)
VMS Empire (C, GPL-2.0, mature, inactive since 2014)
Vocaluxe (C#, C++, GPL-3.0, beta, inactive since 2018)
Vorton (C, GPL-3.0, beta, inactive since 2004)
Voxelands (C++, C, GPL-3.0, beta)
Vulture's Eye (C++, C, NetHack General Public License, mature, inactive since 2015)
VVVVVV (ActionScript, C++, Custom, mature)
Wagic, the Homebrew (C++, C, Objective-C, 3-clause BSD, beta)
Walic (Kotlin, Apache-2.0, mature)
WallBall (Haxe, JavaScript, GPL-3.0, mature)
War Of Kingdom (C, C++, GPL-2.0, beta)
War1 (C, zlib, beta)
Warcraft Remake (Java, GPL-3.0, beta)
warcraft-remake (Java, GPL-2.0, beta)
Wargamer (C++, GPL-2.0, mature, inactive since 2003)
Wargus (C++, Lua, C, GPL-2.0, mature)
Wario-Land-3 (Python, MIT, beta, inactive since 2018)
WarMUX (C++, GPL-2.0, beta, inactive since 2018)
Warp Rogue (C, GPL-3.0, beta, inactive since 2010)
Warzone 2100 (C++, GPL-2.0, mature)
Waste's Edge (Python, GPL-2.0, beta)
Waterkube (Go, MIT, mature)
WAtomic (Pascal, GPL-2.0, mature, inactive since 2005)
WebChess (PHP, GPL-3.0, mature, inactive since 2010)
WebFun (TypeScript, MIT, beta)
WebHangman (JavaScript, GPL-2.0, mature, inactive since 2003)
WebQuake (JavaScript, GPL-2.0, mature, inactive since 2019)
Which Way Is Up? (Python, GPL-2.0, beta, inactive since 2008)
Widelands (C, C++, Lua, Python, GPL-2.0, mature)
Windstille (C++, Scheme, GPL-3.0, beta, inactive since 2017)
Wintermute Engine (C++, C, MIT, beta, inactive since 2013)
WinWar (C#, MIT, mature)
Witch Blast (C++, GPL-3.0, beta, inactive since 2015)
WitchavenGDX (Java, Custom, beta)
Wizardry Legacy (C++, C, Objective-C, GPL-3.0, beta, inactive since 2018)
Wizards Magic (Python, GPL-2.0, mature, inactive since 2012)
Wizznic! (C, GPL-3.0, beta, inactive since 2016)
wkbre2 (C++, GPL-3.0, beta)
wkbre (C++, C, GPL-3.0, beta)
Wograld (C, GPL-2.0, beta)
Wolf3dX (C#, GPL-2.0, beta)
Wolf4SDL (C, GPL-2.0, mature)
Wolfpack Empire (C, GPL-3.0, mature)
Word War vi (C, GPL-2.0, mature)
World of Heroes (Python, 3-clause BSD, beta, inactive since 2009)
World of Might and Magic (C++, LGPL-3.0, beta)
World of Phaos (PHP, GPL-2.0, mature, inactive since 2011)
WWW (JavaScript, GPL-3.0, beta, inactive since 2014)
wxLaserTank (C++, GPL-2.0, mature, inactive since 2009)
Wyrmsun (Lua, C++, GPL-2.0, mature)
X-Force: Fight For Destiny (Pascal, GPL-2.0, beta, inactive since 2011)
X-Moto (C++, GPL-2.0, mature, inactive since 2014)
XArchon (C, C++, GPL-2.0, beta, inactive since 2003)
Xargon (C++, GPL-3.0, mature, inactive since 2015)
xBaK (C++, GPL-3.0, beta, inactive since 2013)
XBill (C, Script, GPL-2.0, mature, inactive since 2001)
XBlast (C, Java, GPL-2.0, mature, inactive since 2005)
Xconq (C++, C, Script, GPL-2.0, mature, inactive since 2005)
xdigger (C, GPL-2.0, mature, inactive since 1999)
xDuke (C, GPL-2.0, beta, inactive since 2010)
Xenowar (C, C++, GPL-3.0, mature, inactive since 2014)
XEvil (C++, GPL-2.0, mature)
xGreed (Pascal, Custom, beta)
XInvaders 3D (C, Objective-C, GPL-2.0, mature, inactive since 2000)
Xjig (C, Custom, mature)
XL Engine (C++, MIT, beta, inactive since 2018)
XMage (Java, MIT, mature)
Xonotic (C, C++, GPL-3.0, mature)
XorCurses (C, GPL-3.0, beta, inactive since 2012)
XPilot NG (C, GPL-2.0, mature, inactive since 2010)
XPilot (C, C++, GPL-2.0, mature, inactive since 2010)
XScavenger (C, GPL-2.0, mature, inactive since 2015)
XSera (C, Lua, MIT, beta, inactive since 2010)
XSkat (Java, Custom, mature)
XSwing Plus (Java, GPL-3.0, beta, inactive since 2010)
xu4 (C++, GPL-2.0, mature, inactive since 2016)
Xultris (JavaScript, XUL, MPL-1.1, mature, inactive since 2011)
Xye (C++, zlib, beta, inactive since 2013)
xygineXT (C++, zlib, beta)
Yamagi Quake II (C, GPL-2.0, mature)
Yet Another Doom Clone (JavaScript, Python, GPL-3.0, mature)
Yet Another Engine (MoonScript, Java, Lua, MIT, beta, inactive since 2016)
YKnytt (C#, MIT, beta)
Yo Frankie! (Blender Script, ?, mature, inactive since 2009)
Yorg (Python, GPL-3.0, beta)
YSoccer (Java, GPL-2.0, mature)
Zandronum (C, Custom, mature, inactive since 2017)
ZAngband (C, Custom, mature, inactive since 2005)
Zatacka X (C, GPL-3.0, beta)
Zatacka (C, C++, GPL-2.0, beta, inactive since 2007)
Zauberer (None, ISC, beta, inactive since 2018)
Zaz (C++, GPL-3.0, beta, inactive since 2010)
ZDoom (C, C++, ZenScript, GPL-3.0, mature)
Zed Online (C++, ?, mature)
Zelda Classic (C, C++, GPL-3.0, mature)
zelda3 (C, MIT, mature)
Zelda: Mystery of Solarus DX (Lua, GPL-3.0, mature)
Zen! (Java, GPL-2.0, mature)
ZEQ2 Lite (Script, ?, beta)
Zero Ballistics (C++, MIT, mature, inactive since 2013)
Zero-K (Lua, GPL-2.0, mature)
Zetawar (Clojure, MIT, mature)
ZGB (C, Assembly, C++, MIT, mature)
Zod Engine (C++, ?, mature, inactive since 2018)
Zone of Control (Rust, Apache-2.0, beta, inactive since 2017)
zorkClone (Java, Apache-2.0, beta)
Zugspiel (C++, GPL-2.0, beta, inactive since 2004)
zztgo (Go, MIT, beta)

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