Odamex is a free, cross-platform, modern client-server Doom engine
3rd Party Video Games Developer: MetalManGames, titles of games
A free 3d game for PC that does not limit the player. Fight,Build,Gain
A real-time 3D Engine written in Ada
A fun realistic multiplayer free-and-open-source first-person-shooter!
Three dimensional first-person space deathmatch!
A fun-filled new take on the casual first person arena shooter.
6DOF zero-g claustrophobic space shooter
An old-school first person shooter from classic Amiga computers
A multiplayer First-Person-Shooter game built in Java 3D
3D. Destroy icebergs & enemies in the dark cold seas of the future.
Free and open source FPS based on Quake III Arena
Game engine supporting many 3D/2D formats and graphic effects