Mercurial SCM - Mercurial is a free, distributed source control management tool.
Fossil - Simple, high-reliability, distributed software configuration management
Apache Subversion - Mirror of Apache Subversion. Contribute to apache/subversion development by creating an account on GitHub.
Bazaar - Bazaar is a tool for helping people collaborate.
Atlassian Bitbucket Server - Atlassian Bitbucket Server is a scalable collaborative Git solution.
darcs - Darcs is an advanced revision control system, for source code or other files.