I use Blender3D for everything I (as a total non-professional novice) would need 3D graphics-wise, but as I understand it, there are a few CAD options available on Linux, and several more that run fine in WINE for those who need more professional or proprietary options.
On Linux there's FreeCAD, SolveSpace, Dune3d and OpenSCAD in (subjective) decending order of capability. FreeCAD still suffers from the "topological naming problem", though there's a fork that helps with that and merging it upstream is an ongoing process.
I purchased Alibre Atom3d because it was the only non-subscription affordable package I could find, but it's quite disappointing and won't run in wine anyway due to the licensing rootkit it uses. So I end up using one of the above linux capable tools, depending on the needs of the model. Each one has its strengths and weaknesses and none is satisfying overall. I reach for OnShape for any design that is going to be open source, because it is a pleasure to use (even though it is web-based), but I don't make enough money from CAD to pay for a $1500 annual subscription.
