Visualizing the results of molecular orbital calculations
 1) MO program:  gaussian, gamess, mopac, etc.
 2) display molecule in 3D:  geo-opt, single-point, nomal mode (animation)
 3) density:  contour plot or 3D view for electron density and MO coefficient
Everything what you want about MO calculation can be seen.

By the distribution policy of the author;
 * Only the latest version is supplied.
 * Users must get the `distfiles' from the original site.
 * Do not re-distribute the source and the executable.
 * Using a not-so-latest version is prohibited, because
   the author may only respond about the latest version.

WWW: http://www.cmbi.ru.nl/molden/