Qhull 2012.1 - Qhull computes convex hulls,

Delaunay triangulations, halfspace inter-

sections about a point, Voronoi diagrams, 

furthest-site Delaunay triangulations, and 

furthest-site Voronoi diagrams.  Qhull 

works with 2-d, 3-d, 4-d, 5-d, and higher 

dimensions.  It computes volumes, surface 

areas, and approximations.  It runs in a 

command window under Windows 95/NT/XP/7.

www.qhull.org, freeware.