Cross-Platform C++ 2D/3D game engine
3D Procedural Game Engine Using OpenGL
3D modeler, 3D game maker, 3D demo maker
A free 3D game engine to create games and realtimes scenes for Windows
LDraw™ editor for LEGO® style digital building instructions.
OpenGL port of the classic 6dof 3D shooter Descent
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Legandary Story of the Zarakite
3D-Accelerated open-source DOOM engine
Fractal planet and terrain generator
Lego Island 2 Game Editor
3D render software animation
Mahasona engine is an open source game engine.
Free-roaming 3D racing game featuring advanced terrain rendering
Free 3D Roguelike action RPG
3rd Person Shooter 3D-Action Game
3D Interactive sandbox environment
3D world editor for game development
Misfit Cubed is a mod of Misfit3D that includes an MD5 exporter