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gfxpoly is a library for doing geometric polygon operations. (like polygon intersection, union, hidden surface removal, stroke to outline conversion, wind rule conversion etc.) It aims to be more easily embeddable than e.g. GX, livarot or CGAL, faster and more stable than libart, and is distributed under a non-commercial license (BSD-2). It's using the algorithm from Hobby  with a few additional ideas from Hershberger  and Bhattacharya et al  (in order to produce a grid-rounded glyph polygon intersection in a single scanline pass) It's very stable- at www.scribd.com, it's used to process (intersect) over 150,000,000 polygons (stemming from figures and illustrations in documents) every single day.  http://ect.bell-labs.com/who/hobby/93_2-27.pdf),  http://www.springerlink.com/content/p46t8502v6q6g687/  http://cccg.ca/proceedings/2007/07a1full.pdf