OpenNURBS itself is somewhat high quality source code, and BRL-CAD wrote a wrapper around OpenNURBS and then implemented the missing surface-surface intersection methods that Rhino kept closed-source:
http://brlcad.org/wiki/User:Phoenix/GSoc2013/Reports
https://github.com/kanzure/brlcad/tree/master/src/other/openNURBS
https://github.com/kanzure/brlcad/blob/master/src/other/openNURBS/opennurbs_intersect.cpp
The BRL-CAD team is highly available over freenode IRC in the #brlcad channel during “normal business hours”.
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