Access Control & Authentication

[eluser]NateL[/eluser]
It's really been a while since I've messed with CodeIgniter but I'd like to dabble with it again.

One of the biggest issues I had with CI was its lack of Access Control and Authentication. It was always a 3rd party library that would eventually lose its developer(s) and fade away into the thousands of threads.

So over the last couple of years, what's become one of the popular auth/acl libraries that's kept up to date and has proven to be fairly solid?

Thanks