This domain used to host the Phabricator instance used for Mercurial review.
Now it hosts a static archive of the differential pages for historical purposes.
We have since moved our review and contribution system to Heptapod.
Some aspects of the contents have been cleaned up in order to limit general footprint, reduce SEO spam, remove useless/redundant information, have working links, etc.
For any questions, contact our mailing lists or come to our IRC channel.