A truly extensible cross-platform game engine
An HTML web game platform
Game framework on top of Python, Panda3D and Twisted
Free strategy browsergame engine.
Little game background framework in java.
8-bit Graphical API for Java
A very small multi-platform game engine for creating desktop games.
also download updates from files section
C-Lesh is a game programming language for 2D games.
CM Game Development Kit
Portable game engine with main focus on point-and-click adventures
A mobile tower 3D tower defense/defend the flag game
A game engine written in the D programming language