Dust3D is a cross-platform open-source 3D modeling software
3D modeler, 3D game maker, 3D demo maker
Cross Platform GUI Toolkit
Tiny OpenGL Wrapper / 3D Engine in C++
Cross Platform Professional Procedural Terrain Generation & Texturing
Cross-platform 2D and 3D game engine
Character animation system for games and simulations.
Realtime 3D engine for game development
A public domain cross platform 3D game
Cross-platform reimplementation of AMOS BASIC (runtime)
3D Engine technology with partial tools developing kit.