The ioquake3 community effort to continue supporting/developing id's
A modern, cross-platform Quake game engine based on FitzQuake.
Open source FPS/RTS Game
Superproject containing build scripts and tools to download assets
Retro game engine for creating games like it's 1997
PAK file editor for Quake engine games
Quake PAK file utility
3D-Accelerated open-source DOOM engine
Game engine for playing tomb raider 1 - 5 levels.
Quake III Arena GPL Source Release
Free and open source FPS based on Quake III Arena