FreeCAD is quite workable, I've constructed some 100 parts for 3d-printing, lasercutting and CNC in it. There are some warts in the UI for sure, but once you get to know them not that hard to deal with. Quite a bit fewer learning resources online compared to Fusion360, but enough videos on Youtube to get started, and the FreeCAD Forum is pretty helpful.

For programmers, one can also use Python to define more complex parts or workflows.