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.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
3rd Party Video Games Developer: MetalManGames, titles of games
OpenGL port of the classic 6dof 3D shooter Descent
DOOM / Heretic / Hexen source port with enhanced graphics and UI
A fun realistic multiplayer free-and-open-source first-person-shooter!
3D-Accelerated open-source DOOM engine
A Marathon (first-person shooter) engine with enhanced features
Bot for id Software's Wolfenstein 3D
A free and open 3d action game.
3D FPS Digital Paintball 3 Multiplayer Online Game
Three dimensional first-person space deathmatch!
AssaultCube is a FREE, multiplayer, first-person shooter game.
A fun-filled new take on the casual first person arena shooter.