1. Reflow automatically creates pull requests, ensures the code review is approved, and squash merges finished branches to master with a great commit message template. - reenhanced/gitreflow

  2. Gitless is an experimental version control system built on top of Git.

  3. Pijul is a free and open source distributed version control system based on a sound theory of...

  4. Mercurial is a free, distributed source control management tool.

  5. Plastic SCM is a cross-platform commercial distributed version control tool.

  6. BitKeeper is an open source distributed version control tool.