Mergefly - A modern UI for GitHub pull requests
Monolist.co - The command center for engineers. Tasks, pull requests, messages, docs — all in one place
Teamder - Tinder, but for creating teams at work.
PullReminders - Review and release pull requests faster with Slack reminders and metrics.
PullRequest.com - Code review as a service
Hound - Your code, always in style. Hound comments on style violations in GitHub pull requests, allowing you and your team to better review and maintain a clean codebase.