In the near past I’ve been working a lot on a small little project named GitMate. It’ll probably be AGPL licensed at some point, it uses coala (AGPL) as it’s core component and assists you in managing your software project and reviewing code.
Check out gitmate.io for more information and a prototype you can use on your GitHub project right now! Support for other “things”, bugzilla, GitLab, BitBucket, … will come at some point. We’re currently occupied writing a real version.