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.
