For home use? For 3d printing? Low cost, like really, really, really low?
1) You might see if OpenSCAD floats your boat. It has distinct strengths and limitations - the former is that it is absolutely and completely parametric, and it is FREE. The latter is that it is purely CSG (though it can import sketches made in a 2d CAD or Inkscape or similar) and that it is purely oriented towards producing STL files. The fact that it is a programming paradigm rather than a draw-on-the-screen paradigm is both a strength and a weakness; sometimes it is so much faster to produce something this way, but it does require a different sort of learning curve.
2) I like FreeCAD, but it too has some strengths and limitations. Strengths include a flexible variety of ways to model - CSG, sketch and extrude, sweep, loft, etc. - and it too is FREE. Both a strength and a limitation is that it is under active development - if a feature is lacking today, it might be implemented tomorrow. But there are quite a few places where the UI is inconsistent across different modules, and sometimes an update will be unstable.
I suspect that both of these run the risk of falling into the "hobby" category, but not sure that is fair; they are both surprisingly capable, and there are very few (if any) things you can do with Fusion 360 that you can't do with these.