The General Atomic and Molecular Electronic Structure System (GAMESS) is a flexible ab initio electronic structure program. Its latest version can perform general valence bond, multiconfiguration self-consistent field, Möller-Plesset, coupled-cluster, and configuration interaction calculations. Geometry optimizations, vibrational frequencies, thermodynamic properties, and solution modeling are available. It performs well on open shell and excited state systems and can model relativistic effects. The GAMESS Home Page has additional information.

Availability and Restrictions


The current versions of GAMESS available on the Oakley and Owens Clusters are:


owens Pitzer
18 AUG 2016 (R1) X  
30 Sep 2019 (R2) X* X*
* Current default version

You can use module spider gamess to view available modules for a given machine. Feel free to contact OSC Help if you need other versions for your work.


GAMESS is available to all OSC users. Please review the license agreement carefully before use. If you have any questions, please contact OSC Help.

Publisher/Vendor/Repository and License Type

Gordon research group, Iowa State Univ./ Proprietary freeware



GAMESS usage is controlled via modules. Load one of the GAMESS modulefiles at the command line, in your shell initialization script, or in your batch scripts, for example:

module load gamess  


Further Reading

General documentation is available from the GAMESS Home page and in the local machine directories.