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The phoenix kit is a collection of tools & working samples to create cross platform role playing games(RPG) of various types including massively multi-player online role playing games (MMORPG).
Realtime 3D game/visualization engine, written in C++, scriptable through Tcl/Tk, Python and Lua. Supports D3D and OpenGL for rendering, runs under Linux and Windows.
Era of Mages is a realtime strategy game with many roleplaying aspects to it. It is inspired by Warcraft but provides players with many new and interesting features. The implementation is done with the pygame (Python+SDL) library.
NiL is a modular multi-purpose gaming engine including a multiplayer worm game a little like quake, except it's 2d and a little like worms except it's realtime.
FEAR is a development kit helping software engineers create advanced artificial intelligence in synthetic characters with simplicity and efficiency. The project includes reusable AI components, portable framework and interfaces to realtime 3D games.