There are other free-as-in-beer options but the only ones that don't have a risk of this happening are the open source packages, of which FreeCAD and SolveSpace

There are other free-as-in-beer options but the only ones that don't have a risk of this happening are the open source packages, of which FreeCAD and SolveSpace are the only current viable 3D options. If you need a parametric cad package for small assemblies or occasional use FreeCAD is most likely workable. I've been using FreeCAD in a light-duty professional capacity for several years now and will be happy to help out anyone who wants to transition to it (email is in my profile). They have a decent tutorials page[0] here for getting started with the basics. [0] https://wiki.freecadweb.org/Tutorials https://wiki.freecadweb.org/Tutorials