devio.us is pretty cool though. But I forgot to mention that you have to apply for an account and you must give them a valid reason for wanting one, if I recall. e.g. education or needing remote compilers for projects or whatever. They don't just give them out for any reason, but it's not exactly hard to get as long as you're human and not trying to make a ton of money with it or whatever.
Edit: well actually even they are closed at the moment it seems.