NEMO (Nucleus for European Modelling of the Ocean) is a state-of-the-art modeling framework for oceanographic research, operational oceanography seasonal forecast and climate studies.
NEMO includes:

• 4 major components
  • the blue ocean (ocean dynamics, NEMO-OPA)
  • the white ocean (sea-ice, NEMO-LIM)
  • the green ocean (biogeochemistry, NEMO-TOP) ;
  • the adaptative mesh refinement software (AGRIF) ;
• some reference configurations allowing to set-up and validate the applications ;
• a set of scripts and tools (including pre- and post-processing) to use the system.

NEMO is used by a large community: 240 projects in 27 countries (14 in Europe, 13 elsewhere), 350 registered users (numbers for year 2008). See "NEMO Projects"

NEMO is available under the CeCILL license (public license).
To gain access to the system, you need to register (click here or on "Register" in top right panel).

The evolution and reliability of NEMO are organised and controlled by a European Consortium between CNRS, Mercator-Ocean, UKMO and NERC.
"Purpose of the Consortium
The purpose of this Agreement is to set up appropriate arrangements for the successful and sustainable development of the NEMO System as a well-organised, state-of-the-art ocean model code system suitable for both research and operational work."

Text of the Consortium Agreement is here:

NEMO is a shared reliable evolving system. These objectives rely on the work of the NEMO System Team.