I hate what Autodesk did with Fusion, but the problems i've ran into while searching for an alternative are: 1) Most packages don't have any included standards

I hate what Autodesk did with Fusion, but the problems i've ran into while searching for an alternative are: 1) Most packages don't have any included standards libraries; this makes modeling a standardized drilled borehole a much more involved affair. It makes hardware provisioning a more involved affair. Much nicer to have included libraries for things like, for example, a #6-32 UNC bolt. No need to go find a bolt and bust out the calipers to verify things like shoulder width and so-on, it's just there. The F360 and Solidworks parts libraries are both great. Nearly non-existent on the free/cheaper alternatives. 2) Most CAD/CAM software I have ran into deals with high poly models terribly. Sure, the solution is to simplify the models, but it's just not a feasible goal when dealing with very complex assemblies. Fusion/Solidworks deal with high polygon stuff as gracefully as possible. Onshape becomes nearly unusable. Freecad gets unstable. I can't comment on complexity with openscad, but it dealt with modeled parametric bolts and nuts just fine in my case; a case which lags most clients due to the high poly count on bolt threads. 3) THREADED HOLES. F360 and Solidworks can deal with standardized threads with ease. Onshape requires a buggy community-written add-on where most standards must be defined rather than found in a look-up table. OpenSCAD has lots of do-able thread solutions. Freecad sucks at threads, as far as i've learned thus far. So, still, the search continues. If I had all the resources in the world i'd buy a Solidworks license. I just like it the best, the simulation packages are nice, the libraries are nice, the UX is nice -- it just feels like quality. Too bad I can't afford it. They were nice enough to let me have a trial license for awhile, but after expiration I was driven to F360 -- which due to recent decisions they've made I totally regret. I wish SW had a free/low cost option, but I recognize that if they did it'd probably compromise the product to the point where i'd no longer be interested, as much as I hope otherwise.