A modern, cross-platform Quake game engine based on FitzQuake.
Orx: Portable Game Engine
A conservative source port of Heretic that is identical to DOS
A conservative source port of Hexen that is identical to DOS
Conservative port of BOOM 2.02 to modern systems.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Cross-platform 2D and 3D game engine
Game engine for playing tomb raider 1 - 5 levels.
Reference implementation for the Doom game engine.