Official NetHack Git Repository
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DOOM Open Source Release
Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.
Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.
Quake III Arena GPL Source Release