541 karma · joined May 23, 2015
An example of a project I want to get to using it is a database CLI app - it can save your credentials, lets you connect to and query the db, give auto-completed suggestions, etc. This is now really easy to do in Javascript, and you just couldn't do that before very easily.
On your question, yeah - there is something Norton Commander-ish - it's a library called blessed, by Christopher Jeffrey, who's pretty boss at CLI apps:
Vantage.js is entirely based on TTY controls, so it wouldn't really work too well in a browser.
It can take on several roles. I think the most prominent are devops / debugging live apps. It gives you a bit more leeway than having to just rely on what you logged before you deployed the app. If you are missing data, it can let you jump into a remote REPL and find out more.
Another one is helping while you are developing an app - you can call functions you are working on and play around with application state. That's why I originally put it together for myself.
But I'm sure others can think of even more inventive uses - that's why I made it extensible so others smarter than me can write plugins.