Last week, GitHub released an awesome feature called Topics. It allows authors to tag their repository.
In response, I'm launching a simple project, Awesome Github Topics. It's an indexed list of the top 500 topics on GitHub that's painstaking filtered and categorized into different categories based on developer interests.
While Github hasn't released an API endpoint for the new topics feature yet. I just crawled the top repos on Github and scanned the tags then ranked all the most commonly used tags based on the total number of stars it had in the collection of repos. It's not a perfect count but it should be good enough on a relative measurement.
Hope you find it useful.