FreeCAD is ok, I use it for simple 3d printing designs, but you have to be very careful how you build the model as it likes to ruin dependencies if you change something in earlier sketch.
1.0 dev builds seem more user friendly.
Like some other good-bones free software, the UI is terrible. I challenge anyone who has prior CAD experience, but no FreeCAD experience, to install the software and design a simple bracket in under an hour.
I tried Fusion under Wine and it didn't really work. I haven't tried NX or Solidworks in the last few years.
