- Home: https://ufoai.org/wiki/News, https://sourceforge.net/projects/ufoai/
- Media: https://en.wikipedia.org/wiki/UFO:_Alien_Invasion
- Inspiration: X-COM: Apocalypse, X-COM: Terror from the Deep, X-COM: UFO Defense
- State: mature
- Download: https://ufoai.org/wiki/Download
- Keyword: strategy, clone, turn-based
- Code repository: https://github.com/ufoai/ufoai.git (mirror, @created 2011, @stars 141, @forks 49), https://git.code.sf.net/p/ufoai/code
- Code language: C, C++
- Code license: GPL-2.0
- Code dependency: Quake II engine, SDL
- Developer: aDuke1, Alexander Tishin, AndrewRSmart, anthraxx, bayo, BTAxis, CH, DarkRain, DarkRainX, drane, Duke, Forest Hale, geever, Holger 'ShipIt' Gellrich, hwoarangmy, Ihor Hrytsenko, Internecivus Raptus, Kostia Romanov, Kracken, Maksym Kobieliev, Martin Gerhardy, Muton-UfoAI, Nate Wright, NateWr, radius75, Rudolfo Pinewood, rxadmin, Sander van Grieken, Sergii Pylypenko, Solbu, Tamás Fehérvári, Tron, UFO: Alien Invasion, UFOAI
Squad-based tactical strategy game in the tradition of the old X-COM PC games.
- Build system: CMake