Community code is a free and shared resource with distributed development and centralized support. Ongoing development of community codes is maintained under version control. Periodic releases, which include the latest in developments of new capabilities and techniques, are made available to the user community.

Developers contribute new software capabilities to a shared software repository, and user support is provided via websites, on–line tutorials, on–site tutorials, workshops and helpdesk functions. Ongoing development of community codes is maintained under software version control, and includes extensive regression and pre–release testing. Periodic software releases, which include the latest in developments of new capabilities and techniques, are made available to the user community. The following codes are available to the community