Orx: Data-Driven Game Engine
8-bit Graphical API for Java
3D .NET engine for Windows, Linux, Mac
A generic 2D engine for any kind of game
Kinect based controller.
Pear3DEngine is a modern and modular 3D development framework
An extensible development framework for roleplay games.
DiaT is a Textadventure
A cross-platform OpenGL based lightweight scenegraph library