Odamex is a free, cross-platform, modern client-server Doom engine
Eureka is a DOOM map editor
Cross compiling environment to DJGPP v1
Source port of Doom, Heretic, Hexen and Strife developed in Delphi
Source port of the game "Mars - The Ultimate Fighter"
Source port of the game Doom developed in FPC/Lazarus
Source port of Doom
A tool for creating Terrains.
Creates voxels and sprites from md2 models
A tool to create textures from DOOM WAD file resources
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Freedoom, Heretic and Hexen
Oblige is a random level generator for classic FPS games
3D-Accelerated open-source DOOM engine
EDGE is an advanced DOOM source port
Doom, Heretic, Hexen & Strife Map Viewer
Extendable editor for manipulating lumps in DOOM WAD files.
Visplane Explorer lets you visualize visplane usage in DOOM maps
Historically accurate Doom source port
Mac OS X clone of Dehacked and Whacked2