A 2D Adventure Game & Engine
C++ game libraries plus server.
Library for creating turn-based games with simultaneous moves.
3D Interactive sandbox environment
A 3D, fully concurrent game engine
Hungry Hero is an open source Flash game built on Starling Framework.
Open source network game service
A truly extensible cross-platform game engine
An open source skateboard games engine written in C# and .NET.
Pear3DEngine is a modern and modular 3D development framework
Cross-platform reimplementation of AMOS BASIC (runtime)
Multi-Language Wrapper Collection for the Irrlicht Engine
AMOS BASIC reimplementation in Java
A framework for games with defense towers along a path.
also download updates from files section
Read and write PGN format and test moves for legality.
The Lambda-Engine is a cross platform game engine.