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...FreeCAD is based on OpenCasCade, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. The interface is built with Qt. FreeCAD runs exactly the same way on Windows, Mac OSX and Linux platforms.
3D slider puzzles for kids; helps teach solid geometry
...They can help improve 3D visualization and problem solving skills. Suitable for children preparing for math or geometry, as well as adults. Works on laptops or PCs or Macs running Windows, OSX, or Linux.
3D multiplayer realtime game with separately packaged 3D graphics
middleware layer built on OpenGL. Runs on Linux, Win32, Mac OSX, Android -
OpenGL/GLES 2.0 or later required