Constructive solid geometry (CSG) and interactive boolean operations inside SketchUp. Free demo here.
Incredibly over-priced compared to other extensions of equivalent complexity/power.
Vertex Tools $20
Profile Builder 2 $60
I disagree. Boolean operations are extremely hard to do robustly. It looks reasonably priced to me.
It’s entirely likely that my cost assessment is based on lack of understanding of how this improves on what the standard boolean tool for solids included in SU can do,