MOLDEN is a relatively simple GUI for Gassian9X, GAMESS, MOPAC93, and other software. It has a relatively simple molecule editor that writes output files in Gaussian Z-matrix format, MOPAC internal coordinates, and cartesian. It reads the ouput generated by these programs and can visualize resulting geometrys, orbital amplitudes, electrostatic potentials, and various aspects of the molecular density. It can also animate vibrational modes, geometry optimizations, and reaction coordinates.
Gaussian94 Water Vibrations RHF/sto-3g