General Natural Bond Orbital Analysis program, for stand-alone GenNBO usage with any valid NBO archive .47 file, as well as for cooperativeESS/NBO interactions with any "NBO6-compatible" host electronic structure system (ESS). [Available as a binary executable (.exe) program for linux/mac/unix or PC-Windows platforms, or in source fortran code for compilation/linking on other platforms.]

Support site:
http://nbo6.chem.wisc.edu/products_css.htm