Mercurial - Fast, lightweight Source Control Management system.
Updated by mgeisler on Saturday, August 16th 2008.
Mercurial (hg) is a revision control system designed for efficient handling of very large distributed projects. Unlike systems like CVS or SVN, Mercurial allows offline commits and has easy branching and merging which allows more flexible workflows than with older version control systems.
Mercurial is used by some projects like Mozilla, Xen and OpenJDK (Java).