Parameters taken from Vogl, Hjalmarson and Dow, A Semiempirical Tight-Binding Theory of the Electronic Structure of Semiconductors, J. Phys. Chem. Sol. 44 (5), pp 365-378 (1983).
Usage exampes in the ipython notebook.
Also added some very old programs that I wrote a long time ago based on some work by Walt Harrison and by Chadi and Cohen that I uploaded here in case it interests anyone. Did my best to update things a bit, but these are mostly here for reference.