A modern, cross-platform Quake game engine based on FitzQuake.
Odamex is a free, cross-platform, modern client-server Doom engine
A cross-platform port of Hexen II game.
3D-Accelerated open-source DOOM engine
Bot for id Software's Wolfenstein 3D
Three dimensional first-person space deathmatch!
The idea isn't to reach you goals, it's to make progress towards them,
AssaultCube is a FREE, multiplayer, first-person shooter game.
A fun-filled new take on the casual first person arena shooter.
Nexuiz-Xonotic Client
3D. Destroy icebergs & enemies in the dark cold seas of the future.