We’ve been using Phabricator for just about a year here at Disqus. It was originally created at Facebook and open sourced in Spring 2011. To sum it up using their own words: “Phabricator is a open source collection of web applications which make it easier to write, review, and share source code.” The small team working on it at Phacility (the SaaS company behind Phabricator) is constantly improving it so it’s on a continuous release cycle.
Jenkins has been used for continuous integration testing here for much longer. I’m not exactly sure for how long since it was setup before I started in September 2011. David Cramer has always been pushing for an ideal continuous integration/deployment system (IE here here) so part of my duties has been to improve what we have to achieve that goal (we’re hiring).
Currently, there isn’t a direct CI hook into Phabricator that is as deep as say Github+Travis. However, with a little script and an simple event listener for Arcanist, we can replicate most of that functionality.