Geogram is a programming library of geometric algorithms. It includes a simple
yet efficient Mesh data structure (for surfacic and volumetric meshes), exact
computer arithmetics (a-la Shewchuck, implemented in GEO::expansion), a
predicate code generator (PCK: Predicate Construction Kit), standard geometric
predicates (orient/insphere), Delaunay triangulation, Voronoi diagram, spatial
search data structures, spatial sorting) and less standard ones (more general
geometric predicates, intersection between a Voronoi diagram and a triangular or
tetrahedral mesh embedded in n dimensions). The latter is used by FWD/WarpDrive,
the first algorithm that computes semi-discrete Optimal Transport in 3d that
scales up to 1 million Dirac masses (see compute_OTM in example programs).

WWW: http://alice.loria.fr/software/geogram/doc/html/index.html