GNU Savannah is a project of the Free Software Foundation, which serves as a collaborative software development management system for free Software projects. Savannah offers CVS, GNU arch, Subversion, Git, Mercurial, Bazaar, mailing list, web hosting, file hosting, and bug tracking services. Savannah's focus is for hosting free software projects and has very strict hosting policies, including a ban against the use of non-free formats to ensure that only free software is hosted.