Plugin that gives you real-time registration?

Hey guys. I was wondering if there was a plug-in that gave you the stuff on the sites where like for example

You write a username, and it automatically sees if it’s available

You write your pass and it automatically says if its long enough

It automatically tells you if the 2nd pass you put in matches with the first

I think you guys get what Im talking about

That really makes your site a lot better and Id love something like that