Cross-platform C framework very compact libraries and tools.
A generic 2D engine for any kind of game
AutoTeach makes kids study and learn in exchange for internet access.
3D Game engine
A mobile tower 3D tower defense/defend the flag game
A world editor for HGE game engine written in python and uses OpenGL.
C++ Framework for slot machine games
Pygrid is an open-source and cross-platform pygame/python 2D engine.
MultiLingual Interactive Fiction
A graphics engine + toolkit.
Sprite Font Creator
Hungry Hero is an open source Flash game built on Starling Framework.
A truly extensible cross-platform game engine
Allows the Sourcemod FunCommands to be limited
Open Source Virtual World and MMOG Development Platform
Generates a menu in an AMXX plugin
cross-platform 2d game engine
Investigo - DX9 Performance and Debugging Toolkit
easy programming language for cross-platform 2d games