> FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size. [Parametric modeling](http://en.wikipedia.org/wiki/Parametric_feature_based_modeler) allows you to easily modify your design by going back into your model history and changing its parameters. FreeCAD is open-source and highly customizable, scriptable and extensible.
>
> FreeCAD is multiplatfom (Windows, Mac and Linux), and reads and writes many open file formats such as STEP, IGES, STL, SVG, DXF, OBJ, IFC, DAE and many others.
>
> [https://www.frecadweb.org](https://www.freecad.org/)

[FreeCAD: Your own 3D parametric modeler](https://www.freecad.org/downloads.php)

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