Program TES is specialized for Voronoi network calculation. It was a more explotable program in our researches in 90-th. The algorithm is described in book: N.N.Medvedev "The Voronoi-Delaunay method for non-crystalline systems", SB RAS, Novosibirsk, 2000 (in Russian). The program code: Fortran77.
This program is free for education and scientific purposes. Using the program one ought to refer to the mentioned book.
EXE-file and an examples: TES_EXE.ZIP
Fortran code of the program: TES_FOR.ZIP