Phabricator is an open source collection of web applications which make it
easier to write, review, and share source code. Phabricator was developed at
Facebook.

It's pretty high-quality and usable, but under active development so things 
may change quickly.

You can learn more about the project and find links to documentation and
resources at: http://phabricator.org/

LICENSE

Phabricator is released under the Apache 2.0 license except as otherwise noted.