A version control system (VCS) is a system for managing changes to documents, programs, and other information. They are commonly used for program development done by a team of people working independently.

CVS (1.11.22) [Helix] [Biowulf]

CVS is a version control system, an important component of Source Configuration Management (SCM).

Subversion (1.6.11) [Helix] [Biowulf]

Subversion is an open source version control system.

git (1.7.4) [Helix] [Biowulf]

Git is a free & open source, distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

mercurial (1.6.4) [Helix] [Biowulf]

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