3dDune is actually pretty capable and simple for basic usecases.

Plasticity for free form hard surface CAD modeling.

If you need parametric CAD then the learning curve jumps significantly and FreeCAD nowdays actually makes sense as with a bit of practice and customization you get to great place.

FreeCAD feels like Blender few years before v2.80 - people outright dismissed it because it had a bit unconventional UX but underneath was already the extremely solid software that now dominates 3D polygon modeling. FreeCAD doesn't have that much of a momentum but i wouldn't be surprised if they became Blender of CAD over time.