A modern, cross-platform Quake game engine based on FitzQuake.
A cross-platform port of Hexen II game.
Odamex is a free, cross-platform, modern client-server Doom engine
Eureka is a DOOM map editor
Bots for the Half-Life mod Firearms 2.4 - 3.0
Fast small FPS using JOGL and JOAL
A free 3d game for PC that does not limit the player. Fight,Build,Gain
PAK file editor for Quake engine games
DOOM / Heretic / Hexen source port with enhanced graphics and UI
3D-Accelerated open-source DOOM engine
EDGE is an advanced DOOM source port