monotone!

Mercurial is a free, distributed source control management tool. It efficiently handles projects of any size and offers an easy and intuitive command line interface. Mercurial efficiently handles projects of any size and kind.

Apache Subversion (SVN) is a centralized version control system similar to CVS (Concurrent Versions System) , but based on the concept of change-sets instead.

Simple, high-reliability, distributed software configuration management. Fossil is a distributed version control system, bug tracking system and wiki software server for use in software development.

Springloops is a unique SVN/Git source code management tool focused on web development teams. It allows you to code in parallel and share your code safely concentrated on results, not on lost changes or overwritten files. With lightning-quick deployments, you get rapid collaboration in protected space.

Darcs is an advanced revision control system, for source code or other files. It is fully distributed, and supports lazy fetching of the remote repository (fetching only what is needed at the time, rather than all history). It works best with text files, but it can also store binary files.

AccuRev is a software configuration management tool which addresses complex parallel and distributed development environments with its stream-based architecture, to accelerate your development process and improve asset reuse.

A Unified Engineering Platform for Product Development

SpectrumSCM is a powerful, easy-to-use, intuitive and full featured SCM tool, that includes version control, process control/management, release management, branching, issue tracking and much more, all integrated in one tool.

Cross platform version control software