[neandrake]

We've been using Phabricator for a few years and have been really happy with it. Initially we brought it on board to help with code reviews (which it is fantastic at), but have since also used it to help manage projects being collaboratively worked on with external customers. I usually jump at every chance to talk about it with others who are interested in learning more.

Definitely check it out if you're looking for hosted or self-hosted alternatives to GitHub/GitLab/BitBucket, especially if you use Mercurial (or SVN).