2D physics engine that enables you to play with the laws of physics (such as gravity or air resistance) to test the objects, machines and liquids you have just designed; only an older version is available for Linux.
3D real-time simulation that’s similar to Second Life. Can be used individually or on a network and includes its own scripting and physics engine. Enables you to create your own contents, such as 3D objects, textures and behaviour patterns.
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