NCAR CCSM
The Community Climate System Model (CCSM) is a coupled climate model for simulating the earth's climate system. Composed of four separate models simultaneously simulating the earth's atmosphere, ocean, land surface and sea-ice, and one central coupler component, the CCSM allows researchers to conduct fundamental research into the earth's past, present and future climate states. The Community Climate Model (CCM) was created by NCAR in 1983 as a freely available global atmosphere model for use by the wider climate research community. The formulation of the CCM has steadily improved over the past two decades, and usage of the model has become widespread in the university community, and at some national laboratories.
CESM is sponsored by the National Science Foundation (NSF) and the U.S. Department of Energy (DOE). Administration of the CESM is maintained by the Climate and Global Dynamics Division (CGD) at the National Center for Atmospheric Research (NCAR).
References:
CCSM version 3.0 was released to the public in June 2004. This web page deals specifically with the CCSM3.0 release.
http://www.cesm.ucar.edu/models/ccsm3.0/
This journal article describes the newer CCSM4.0 release.
http://climate.calcommons.org/bib/community-climate-system-model-version-4