GraphQL is a really elegant way of querying a datastore, instead of REST or SQL. Eg https://waywardmonkeys.org/2016/03/15/graphql-beyond-the-web/ (querying OS metadata example)
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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
sqlplus.el is fantastic for querying Oracle databases from Emacs. It's ironic that a proprietary DB has the best mode http://t.co/gjkWNg45tQ