Python language has a well known feature named interactive mode where the interpreter can read commands directly from tty.
I typically use this mode to test if a given module is in the classpath or to play around and test some snippets.
Do you know any other programming languages that have Interactive Mode?
If you can, give the name of the languages and where possible, a web reference.
If it is already mentioned, you can just vote for it.
Most (all?) lisps (including common lisp, scheme and clojure), sml, ocaml, haskell, F#, erlang, scala, ruby, python, lua, groovy, prolog.