Pygrid is an open-source and cross-platform pygame/python 2D engine.
A 3D, fully concurrent game engine
This pack add's custom object and rides into your "RCT3 Platinum" game
A game development kit for Sifteo Cubes.
Extremely simple joystick rumble / vibration library
Hungry Hero is an open source Flash game built on Starling Framework.
3D game engine for C and C++
A graphics engine + toolkit.
Sprite Font Creator
Create your own animated characters for games with ease!
Little game background framework in java.
Pear3DEngine is a modern and modular 3D development framework
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
An extensible development framework for roleplay games.
C++ Game programming Framework
Phobos editor is a generic resource editing system.
QuadTree JS is a library for game developers
big map framework using Irrlicht
Powerful html5 & javascript library for creating applications & games.
Fully fledged steam community SDK
Cross-platform reimplementation of AMOS BASIC (runtime)