GitHub Stars Tagger is described as 'A Google Chrome extension that lets you add tags to your starred repositories directly on GitHub' and is an app in the Web Browsers category. There are three alternatives to GitHub Stars Tagger for Online / Web-based, Cloudron and Mac. The best alternative is Astral, which is both free and Open Source. Other great apps like GitHub Stars Tagger are Gitrep (Free) and Oh My Star (Paid).
Astral pulls down all of your starred repositories on GitHub and allows you to organize them using one or more tags. = Tags = Tags are the bread and butter of Astral. Simply add one or more tags to a repository, and keep them organized however you like.