Hi Anton,
I wrote R-Node many years ago as a proof of concept that a web-based IDE for R could work. At the time I also used NodeJS in it's early forms for the server and what is now an early version of ExtJS.
This proved successful, but as it was a side project of limited use in my day job maintaining it as NodeJS and ExtJS evolved became difficult.
As such, I have the codebase as it was, but it won't work on any new system without some upgrade effort, something I don't have the time for at the moment.
) has a web frontend apparently now. You could also see this Stack Overflow thread: