Does anyone know if something like this exists for other languages as well? Ruby, nodejs?

Have a look at Vorpal JS

http://vorpal.js.org/

The vorpal object emits Inquirer[1] and Chalk[2]

[1] https://github.com/SBoudrias/Inquirer.js/

[2] https://github.com/chalk/chalk

I just installed this because the autocomplete looked cool in the screenshots and wanted to check it out live. I wish we could have this in fish shell.

Cool, just about to ask that.

So neat, good to know.