As Metin Seven mentioned in his MagicaCSG Blender thread.
A free demo of the little SDF-Modeler "MagicaCSG" is now
available (PC only and for non-commercial use only). The range
of Features is somewhat limited compared to the Patreon
version but still workable.
This Modeler is made by "Epthracy" the same guy who
made "MagicaVoxel"
Download and played with it a bit. Kind of reminded me of Groboto3D but disappointed there is NO export to OBJ option.
Truly wish Darrell Anderson and Braid Art Labs would recommence development on this fine little app.
Tried Curvy3D for some time but just can not get the hang of it. And many of the functions can be done in 3D Coat which is much more user friendly then Curvy3D.
I stopped using all other AI tools (except those in Photoshop) since I started using VIZCOM AI. It is simply the best for what I want to do - cars and vehicles.
Frenchy, I truly appreciate all the links and tips you post.