Gabedit is a graphical user interface to computational chemistry 
packages like deMon2k, Gamess-US, Gaussian, Molcas, Molpro, MPQC, 
MOPAC, Orca, PCGamess and Q-Chem.

It can display a variety of calculation results including support for
most major molecular file formats. The advanced "Molecule Builder"
allows to rapidly sketch in molecules and examine them in 3D. Graphics
can be exported to various formats, including animations.