A game development kit for Sifteo Cubes.
A retro style video game engine for RPGs and adventure games.
GameWizzard is a Sprite editor.
3D world editor for game development
Phobos editor is a generic resource editing system.
Pear3DEngine is a modern and modular 3D development framework
cross-platform 2d game engine
Delphi-like IDE for cross-platform game development
Sourceport of the classic Descent Level Editor
AMOS BASIC reimplementation in Java
DREAM is an Open Source GCS