Phabricator used by Facebook
Phabricator is a suite of web-based development collaboration tools, which includes a  code review tool called Differential, a repository browser called Diffusion, a change monitoring tool called Herald, a bug tracker called Maniphest, and a wiki called Phriction.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 overseen by Evan Priestley. Priestley left Facebook to continue Phabricator's development in a new company called Phacility.On May 29, 2021, Phacility announced that it was ceasing operations and no longer maintaining Phabricator starting June 1, 2021. A community fork, Phorge, was created and announced its stable release to the public on September 7, 2022.