Odamex is a free, cross-platform, modern client-server Doom engine
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
Hardcore 3D space shooter with spaceship upgrade possibilities.
GemRB is a portable open-source implementation of the Infinity Engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
WW2 U-boat simulation
3D modeler, 3D game maker, 3D demo maker
Cross-platform real-time strategy game (3D)
The library needed to make all those games true
3D third person platform shooter
3D-Accelerated open-source DOOM engine
Bot for id Software's Wolfenstein 3D
Sokoban clone with 3d rendering
SokoHedron is a Sokoban clone with 3d gameplay.
a very lightweight advanced terrain-rendering and 3D map rendering sys