What are some alternatives?
Mercurial SCM - Mercurial is a free, distributed source control management tool.
Bazaar - Bazaar is a tool for helping people collaborate.
Fossil - Simple, high-reliability, distributed software configuration management
Perforce - Self-hosted Version Control Software
SourceTree - Mac and Windows client for Mercurial and Git.
darcs - Darcs is an advanced revision control system, for source code or other files.