- Home: https://web.archive.org/web/20200806135224/https://bitbucket.org/gopostal/workspace/projects/P1OS
- Media: https://en.wikipedia.org/wiki/Postal_(video_game)#Open_source
- Inspiration: Postal
- State: beta, inactive since 2018
- Keyword: remake, content commercial + original required, shooter
- Code repository: https://bitbucket.org/gopostal/postal-1-open-source (hg)
- Code language: C++
- Code license: GPL-2.0
- Code dependency: SDL2
Source code of Postal 1 (also on Github maybe?).