The popular GUI for GAMESS MacMolPlt has now been renamed and moved to GitHub, wxMacMolPlt is a cross-platform (Mac OS X, Linux and Windows) GUI for preparing, submitting and visualizing input and output for the GAMESS quantum chemistry package. Features include a graphical molecule builder, GAMESS input generation, animation of output and visualization of molecules, normal modes, orbitals and other properties

wxMacMolPlt can be downloaded from here

Bode, B. M. and Gordon, M. S. J. Mol. Graphics Mod., 16, 1998, 133-138. DOI