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We are shutting down Ondsel | Ondsel
(ondsel.com)
Your own 3D parametric modeler.
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
I had tried FC a few times previously, and wasn't able to make it work for me, but I'm actively using the newest release candidate now. I think it's finally over the hump where a lot more people are going to start adopting it. That should fuel continued development.