GitHub now allows you to group your starred projects into lists: https://github.blog/changelog/2021-12-09-lists-are-now-available-as-a-public-beta/
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When adding a new language to difftastic, it's hard to find interesting git repositories to test against.
I've started just querying GitHub for the most starred repos for a given language. For example, here's Haskell: https://github.com/search?l=&o=desc&q=stars%3A%3E500+language%3AHaskell&s=stars&type=Repositories