A generic 2D engine for any kind of game
AutoTeach makes kids study and learn in exchange for internet access.
A 2D Adventure Game & Engine
Java Gamepad API for multiple platforms
C++ game libraries plus server.
Modular Gaming Open Source Persistent Browser Based Game Framework
TurboSphere is an easy to learn and powerful JS based game engine.
Library for creating turn-based games with simultaneous moves.
A world editor for HGE game engine written in python and uses OpenGL.
A mobile tower 3D tower defense/defend the flag game
3D Interactive sandbox environment
A 3D, fully concurrent game engine
Pygrid is an open-source and cross-platform pygame/python 2D engine.
C library for manipulating Minecraft world data
Extremely simple joystick rumble / vibration library
3D game engine for C and C++
A graphics engine + toolkit.