I’m doing a bit of BREP for GIS and even in 2D with line segments only the problem is really non-trivial, a lot of edge (pun intended) cases to take care of. Type system helps enormously, so probably rust will be a win here (I think I saw a project along those lines).
That being said, for CAD (personal usage) I switched from Fusion 360 to Freecad 1.0 with almost no project and the latter is an order of magnitude faster.
Agreed, FreeCAD 1.0 is finally almost usable and supports assemblies. My main issue with it is that the bill of materials tool was DOA but it’s fixed in the main branch. There are still lots of quirks but these can be learned in a few hours of using it.
Worth noting there's also a fork of FreeCAD (Astocad, made by a former Ondsel developer) with some UI enhancements: http://astocad.com/
I really like this pricing model, reminds me of aesprite.
Either build it yourself for free, or pay us and we'll give you prebuilt binaries for convenience