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
Three dimensional first-person space deathmatch!
The idea isn't to reach you goals, it's to make progress towards them,
A fun-filled new take on the casual first person arena shooter.
3D. Destroy icebergs & enemies in the dark cold seas of the future.