git:logs - The definitive list of open source resources on Github
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Reviewly - Create take-home projects to send to your job candidates, where you can ask them to code, discuss an issue, and/or review a PR directly in a private repository on GitHub.
AppScope - Appscope, one of the leading directories for Progressive Web Apps (PWAs).
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Board for Github - A webview based GitHub project app with native features