Phabricator is[5] a suite of web-based software development collaboration tools, including the Differential code review tool, the Diffusion repository browser, the Herald change monitoring tool,[6] the Maniphest bug tracker, and the Phriction wiki.[7] Phabricator integrates with Git, Mercurial, and Subversion. It is available as free software under the Apache License 2.0.

Phabricator was originally developed as an internal tool at Facebook.[8][9][10] Phabricator's principal developer is Evan Priestley.[1] Priestley left Facebook to continue Phabricator's development in a new company called Phacility.[2]

On May 29, 2021, Phacility announced that it was ceasing operations and no longer maintaining Phabricator on June 1st 2021.[5] There are attempts to develop a community maintained fork called but it remains to be seen if this will succeed.