A team at Indiana University created Scholarometer to "facilitate citation analysis and help evaluate the impact of an author's publications." The crowdsourced data created through the Scholarometer platform is available through the Scholarometer API that allows developers to track certain authors through name, citation, disciplines, relevance, and other metrics.
RhymeBrain is a service made to help writers, or anyone else for that matter, find rhymes for words, make new portmanteaus, and alliterate well. When writing with figurative language, or writing poems, such a tool can be very helpful for a writer who's currently stuck. It might also be helpful for such things as computer generated literature, but for that, you'd want a robust API with full access to the database. Well, you're in luck, because it does indeed exist.