Meteorite - Smarter GitHub notifications.
Neat.run - Neat puts SaaS notifications in your menu bar. Streamline your code review and ship with ease. Preview, triage, and jump to issues in one click or keystroke.
Octobox - Untangle your GitHub Notifications
GitHub Reader - A quick way to browse GitHub issues and pull requests.
Refined GitHub Notifications - UI improvements for the new GitHub Notifications page
Codetree - You can manage your entire development process through GitHub.