I don’t completely understand the “LGPL but please don’t redistribute the binary” thing here. If you don’t like the freedoms of the LGPL, why didn’t he just use a different, presumably non-free, license?
The Parasolid CAD Kernel is a commercial product, so the software is sold on the main website — apparently the $99 just barely covers the license and various fees.
Or maybe Manifold since it always makes manifold geometry, but I have zero idea what that would take. I note that it uses SDFs and that implicitcad being based on SDFs was supposed to make fillets and chamfers easy. But I have no idea how the Parasolid kernel works.
Manifold just seems to me like the most interesting recent development in CAD kernels.