Most Lisps will integrate with Emacs out of the box as an "inferior lisp process" which supports something I think is more valuable: send code straight from an

Most Lisps will integrate with Emacs out of the box as an "inferior lisp process" which supports something I think is more valuable: send code straight from an editor buffer to an embedded REPL. This completely removes the copy-and-paste step you have when working with a regular, detached REPL. One of the more impressive uses of this is with ClojureScript, which integrates the compiler with a bit of JS running in a browser to allow you to send Cljs code straight from your editor to the browser. You can use SLIME with Common Lisp and Clojure which is similar but adds a number of features like hints, docs, and debugging, although it was originally designed for CL so Clojure support is less powerful. There are definitely Emacs modes like this for other languages, and probably similar plugins or whatever for other editors.