I've been using Phabricator a lot recently, and it's ace. We started using it because we wanted to start doing code review, and the task tracking came along 'fo

I've been using Phabricator a lot recently, and it's ace. We started using it because we wanted to start doing code review, and the task tracking came along 'for free'. It's nice & lightweight (in terms of UI), is usable from the commandline via the arcanist tool, and integrates well with the other Phabricator tools. Downsides? The website's sense of humour is irritating if it doesn't click with you. You have to host it yourself, which can be about a morning of setup. The documentation can be a little bit sparse. But it's the first bug tracking/developer workflow tool I've used that I've actually liked. And I like it a lot.