Wikipedia
Phabricator
Phabricator is a suite of web-based software development collaboration tools, including the Differential code review tool, the Diffusion repository browser, the Herald change monitoring tool, the Maniphest bug tracker and the Phriction wiki. Phabricator integrates with Git, Mercurial, and Subversion. It is available as free software under the Apache License, version 2.
Phabricator was originally developed as an internal tool at Facebook. Phabricator's principal developer is Evan Priestley. Priestley left Facebook to continue Phabricator's development in a new company called Phacility.