What plugin drives the WPMUdev login box?

Which plugin(s) do you all use to drive the login box on this website?

User clicks "Log in," then down drops a very snazzy and simple form with options for registration, FB login, and Google login. SWEET. This is exactly the solution I've been looking for for my site.

Can you share the secret sauce? There are so many login plugins, I'm not sure how to emulate what you've got here.

Thanks!