I purchased Groboto 3.3 on the promise that Darrel Anderson was working on ver 4. I realize he ended up with a serious illness in cancer and that delayed it.

However after regaining his health he concentrated all efforts on MeshFusion.

Now that Modo has died, I wonder if Braid Arts will pickup on Groboto3D?

And for the record, I truly believe Nvil is pure trash and would not recommend as long as Blender is free or Silo3D is still being developed.

Wings3D is also still being supported and has a very friendly and quite helpful user base.

The simplicity of Wings3D and Silo3D' user interface is awesome, as is MOI3D.