Odamex is a free, cross-platform, modern client-server Doom engine
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Eureka is a DOOM map editor
Cross-breeding a 3D FPS with a fantasy RPG in the world of Hexen
DOOM® Multiplayer Battles👿
Bots for the Half-Life mod Firearms 2.4 - 3.0
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
Bot for id Software's Wolfenstein 3D
Clone of Urban Assault with new Graphics.