Phabricator, a software fabricator

Phabricator is a suite of web applications that help software companies communicate about software effectively. It was created at Facebook. Phabricator is also used at many other companies such as Airtime, Asana, Dropbox, deviantART, MemSQL, Path, Quora, and more.
Facebook engineers rave about Phabricator, describing it with glowing terms like "okay" and "mandatory". Experience more uncoerced community interaction on Facebook.

http://phabricator.org/