3D .NET engine for Windows, Linux, Mac
Open Game Bootstrap
evolution for vegastrike SpaceSim/Combat/Trade game
Gives agents personality, moods, emotions and emotional attachments.
Cross-platform C framework very compact libraries and tools.
A generic 2D engine for any kind of game
C++ Framework for slot machine games
A truly extensible cross-platform game engine
Open Source Virtual World and MMOG Development Platform
cross-platform 2d game engine
A cross-platform OpenGL based lightweight scenegraph library
AMOS BASIC reimplementation in Java
Cross-platform 2D game engine
A cross platform 3d c++ game engine
also download updates from files section
Read and write PGN format and test moves for legality.
Basic real-time simulation engine in C++