It can be, for example, used as server to produce content for other applications. In command line mode, FreeCAD runs without its interface, but with all its geometry tools.

FreeCAD also runs as a command line application, with low memory footprint.FreeCAD has a complete Graphical User Interface based on the famous Qt framework, with a 3D viewer based on Open Inventor, allowing fast rendering of 3D scenes and a very accessible scene graph representation. It runs and behaves exactly the same way on Windows Linux and Mac OSX platforms. FreeCAD runs exactly the same way on Windows, Mac OSX and Linux platforms.

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.

It is 100% Open Source and extremely modular, allowing for very advanced extension and customization. FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties.

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