Well, it is useful but not universal, and may be a bit confusing in a few places. For example, the "repl" entry for Common Lisp is M-x slime which of course is

Well, it is useful but not universal, and may be a bit confusing in a few places. For example, the "repl" entry for Common Lisp is M-x slime which of course is Emacs-specific (and M-x shell for Clojure is setup-specific on top of that). There are a few items missing (eg regex substitution in Emacs Lisp). But in general, a nice resource, thanks!