CIDER

CIDER is a collection of Emacs packages that provide a full-featured interactive environment for Clojure and ClojureScript development. According to the author, Bozhidar Batsov, CIDER is an acronym for the "Clojure(Script) Interactive Development Environment that Rocks".

Clojure

Clojure is a dialect of the LISP language that runs on the Java Virtual Machine. Clojure provides strong support for several modern programming paradigms- functional programming, concurrency and immutability. Clojure was created by Rich Hickey and first released in 2009. Clojure is opensource and is maintained under the stewardship of Cognitect Inc..