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.
Allows you to build virtual Lego bricks on top of one another using your PC. You can construct buildings, vehicles and other models and, to help make your virtual models real, just press a button and the program produces a list of all the bricks you need. For inspiration, it comes supplied with various construction manuals.
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.