CGAL

"CGAL is a software project that provides easy access to efficient and reliable geometric algorithms in the form of a C++ library. CGAL is used in various areas needing geometric computation, such as geographic information systems, computer aided design, molecular biology, medical imaging, computer graphics, and robotics.

The library offers data structures and algorithms like triangulations, Voronoi diagrams, Boolean operations on polygons and polyhedra, point set processing, arrangements of curves, surface and volume mesh generation, geometry processing, alpha shapes, convex hull algorithms, shape analysis, AABB and KD trees...

Learn more about CGAL by browsing through the Package Overview."

http://www.cgal.org/

https://github.com/CGAL/cgal

"The CGAL Bindings project allows to use some packages of CGAL, the Computational Algorithms Library, in languages other than C++, as for example Java and Python. The bindings are implemented with SWIG."

https://github.com/CGAL/cgal-swig-bindings/wiki