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.
Eureka is a DOOM map editor
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
A real-time 3D Engine written in Ada
Bots for the Half-Life mod Firearms 2.4 - 3.0
3rd Party Video Games Developer: MetalManGames, titles of games
Fast small FPS using JOGL and JOAL
The Free & Popular opendhcp application for Physical & Virtual Machine
A free 3d game for PC that does not limit the player. Fight,Build,Gain