SDL based generic 2D game engine
Built to be ease of use, with no programming knowledge, Multi-platform
A retro style video game engine for RPGs and adventure games.
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