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.
Cross-breeding a 3D FPS with a fantasy RPG in the world of Hexen
A free 3d game for PC that does not limit the player. Fight,Build,Gain
A real-time 3D Engine written in Ada
Volume 3 of ChaosEsque Anthology
Open source FPS/RTS Game
Volume 2 of ChaosEsque Anthology
PAK file editor for Quake engine games
Merges WAD files for Doom engine games.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
A fun realistic multiplayer free-and-open-source first-person-shooter!
3D-Accelerated open-source DOOM engine
EDGE is an advanced DOOM source port