I'm currently working on a tool to help with code reviews queue - automatic reminders, single queue list from multiple teams and more. At the moment it works only for GitLab because that's what I needed for myself. If you had used https://pullpanda.com/ with GitHub, you will definitely know what's this about.

No production website yet, but I'm already using it daily. I need to deploy it to heroku and release a version that can be usable to others. If you'd like to try it out, please reach out to me here or on twitter @arathunku