The immutable database Datomic (from Rich Hickey, inventor of Clojure) is all based on datalog, and is fairly popular in the nichey world of Clojure development

The immutable database Datomic (from Rich Hickey, inventor of Clojure) is all based on datalog, and is fairly popular in the nichey world of Clojure development; there are several other similar datalog-based systems outside of Clojure as well. Various marketing case study blurbs are here if that's your thing: https://www.datomic.com/nubanks-story.html https://www.datomic.com/nubanks-story.html