Delaunay triangulations and Voronoi diagrams, with point location , by Eric C. Olson Convex hulls, Delaunay triangulations, Voronoi diagrams, and proximity graphs by James E. Baker, Isabel F. Cruz, Luis D. Lejter, Giuseppe Liotta, and Roberto Tamassia.
Source code is available.
An interactive meshing demo from Paul Chew 's guaranteed-quality mesh generation page. Access is sporadic. DUST , a program for visualizing Voronoi diagrams, Delaunay triangulations, minimum spanning trees, and matchings in various metrics.