What alternatives to IRB are there?

Question

In the python world, there are a number of alternative python interpreters that add cool additional features. One particularly useful example is bpython, which adds dynamic synt

Answer 1

There's not much in the area of alternatives to irb, but there are a couple of gems that add useful features to irb.

Most notably wirble, which, among other things, gives you colored output (not input though) and a history that goes beyond the current session.