FreeCAD - An Open Source parametric 3D CAD modeler
FreeCAD is a parametric 3D modeler. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters. 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.