"Fossil is a distributed software version control system that includes an integrated distributed wiki and an integrated distributed bug-tracking system all in a single, easy-to-use, stand-alone executable." From the creator of SQLite.

Tailor is a tool to migrate or replicate changesets between ArX, Bazaar, Bazaar-NG, CVS, Codeville, Darcs, Git, Mercurial, Monotone, Subversion and Tla repositories.