Lib2geom
From Inkscape Wiki
I've started this page on the Inkscape Wiki to help the lib2geom team with some developer documentation. As this material matures it can be moved to the "Developer Documentation" section of the wiki instead of where it currently resides. (2006-09-01 Scott Huey)
WorkingWith2GeomFAQ: reallife questions answered about using 2Geom in real code
lib2geom py2geom: python bindings to 2geom. With this you can use the power of 2geom in python scripts.