A mobile tower 3D tower defense/defend the flag game
A 3D, fully concurrent game engine
A retro style video game engine for RPGs and adventure games.
A game development kit for Sifteo Cubes.
2D Game Engine, based on OpenGL and focused on Isometric Games
3D game engine for C and C++
A truly extensible cross-platform game engine
3D world editor for game development
A very small multi-platform game engine for creating desktop games.
Game development toolkit
Pear3DEngine is a modern and modular 3D development framework
cross-platform 2d game engine
Cross-platform reimplementation of AMOS BASIC (runtime)
Multi-Language Wrapper Collection for the Irrlicht Engine
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine