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OpenSim - Open Simulator. Primarily a 3D simulator for multiple indoor and outdoor mobile robots. Includes 3D real-time rendering (via OSG) and a physics engine (via ODE). Current emphasis is on manipulators.
Nuclear is a family of open source game engines written to be able to read most standard game formates such as BSP(Quake I, Quake II, Quake III, and Half-Life) MDL, MD2, MD3, and many more.
Quake II Weapons Facotry (THE Team fortress for Quake II) meets Quake III Arena WFA. The engine is founded on Q2 GPL code, and uses the WFA media. Visit the main website for more details.
TimeSnake is (will be) a real-time, network capable game engine, kept modular to facilitate portability. Emphasis on keeping frame rate high, for a level playing field in competitive gaming. Dragon Fly is the first game using TimeSnake, a 3D fantasy base
...A simple scene manager is included using plugin style building blocks and object pathfinding. Also included is a 2D world editor with graphical features. SmartMap is currently built in conjunction with the Axiom 3D rendering engine.