I'm starting to feel disappointed with REPLs that force me to do everything with text. I've used several environments that allow the presentation and manipulation of graphical data, and I wish all languages had it. Here's a short list of the graphical REPLs (in the broad sense) I'm aware of:

1. CAS typically have this: Mathematica, Maple, Axiom, MuPad, Sage\*, etc.
2. The most recent version of IPython (notebook interface)
3. DrRacket
4. Factor's REPL

Are there any for other languages out there?

\* If it weren't for IPython I'd recommend Sage notebooks to all python users, even non-mathematical ones.