Hexagon : dead yes but yet mature one! :)
Sufficient for some many things...
Has a friendly Interface...
Here Dynamic Geometry...


Alas Amapi never comes back!...
Some little numerous happy fews have the last beta version who blend Nurbs and Polys! ;)

All videos of the manual http://docs.daz3d.com/doku.php/public/software/hexagon/2/userguide/start are here!
https://www.youtube.com/@hexagontutorials3513/videos