I came across this on Reddit earlier and afterwards had a lot of trouble finding it again, as I did not remember that I saw it on Reddit.
Consolex is an Elixir package that can be added as a dependency to any Elixir project, which will then allow you to go to http://localhost:5984 to see a web-based version of the IEx console, with a multiline code editor.
It also seems to remember the history of things before the current session, which is something IEx (or rather, the Erlang console it is built upon) is lacking at this time.
