https://www.rhino3d.com/opennurbs [rhino3d.com]

The nurbs import is very hit and miss with Houdini

Houdini does not have standard format of iges. eg 143

99.9% Of All CAD Software can import and export .3dm

Many of us use CAD software would be HUGE benefit for us all if we had

standard Nurb Format for Houdini.

“There are no restrictions. Neither copyright nor copyleft restrictions apple”

i cannot stress this enough its so badly needed.

there is also a possibility of the CAD Kernel?
it will cost some bucks (okey it's depending of the suppliere price range: $$ -> $$$$$$$$$$ :-)) but you get much more then just a importer for that. CAD Modeling in houdini would be impressiv.

opencascade is also there but the api is not a pleasure or it just hated me. :-/