PCPC · 2009 · 2D physic based combat game
Hammerfight
Hammerfight (PC, 2009) has an official source code release.
Data checked 2026-10-12 · unbaked registry
Projects
Wikipedia: open-source code, proprietary assets; source released 2011 by/for Konstantin Koshutin. For the third Humble Indie Bundle Ryan C. Gordon ported the underlying game engine, "Haaf's Game Engine", to Linux and Mac OS X, and released…
What you need
You need your own copy of the game: these projects ship code only.
More on PC
Found via en.wikipedia.org/wiki/List_of_commercial_video_g, hothardware.com/News/Humble-Indie-Bundle-Sells-L, blog.wolfire.com/2011/08/HGE-comes-to-Mac-and-Li
GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.