Mercurial
Mercurial is an open-source distributed version control system created by Matt Mackall in 2005.
Mercurial was released by Matt Mackall in 2005 and is written mainly in Python. Like Git, which appeared the same year, it is distributed, with every user cloning a repository's full history. Its command-line tool is named hg, after the chemical symbol for mercury.
Mercurial is free software distributed under the GNU GPL. It records history as a series of changesets and can be customized with extensions.
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