FreeCAD is a parametric 3D modeler for CAD, MCAD, CAx, CAE, and PLM, aimed directly at mechanical engineering and product design.

It will also fit a wider range of uses in engineering, such as architecture or other engineering specialties. It is 100% Open Source and extremely modular, allowing for very advanced extension and customization.

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.

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