SDL based generic 2D game engine
Updated emulator of Forgotten Realms: Unlimited Adventures
Lego Island 2 Game Editor
Animation graph editor.
Built to be ease of use, with no programming knowledge, Multi-platform
3D Game engine
This pack add's custom object and rides into your "RCT3 Platinum" game
A game development kit for Sifteo Cubes.
A retro style video game engine for RPGs and adventure games.
GameWizzard is a Sprite editor.
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
DREAM is an Open Source GCS