QuakeForge is a 3D first-person shooter game engine based on id Software's legendary Quake and QuakeWorld game engines. Our purpose is to improve the state of the game by improving the engine, making a good base for game and engine modifications, and making it accessible to the largest number of players we can. We like it, and we think you will too.

To get just the latest code: git clone --depth 1 git://git.code.sf.net/p/quake/quakeforge
Or for the full history: git clone git://git.code.sf.net/p/quake/quakeforge