Savannah aims to be a central point for development, maintenance and distribution of official GNU software. In addition, for projects that support free software but are not part of GNU, a separate area of the resource is available. Savannah hosts free projects that run on free operating systems and without any proprietary software dependencies. The version Control systems available on Savannah are GNU Arch, GNU Bazaar, CVS, Git, Mercurial, and Subversion.