Where can I find a good open source user account management class/library in PHP?

I am looking for a good framework for user and user group management in PHP. I want a to be able to add/edit/dele开发者_JS百科te profile, save in a db; add/edit/delete groups; assign a user as group leader, nothing more.

I tried http://www.phpclasses.org. There are many options there but I simply don't know which once to go for. I don't have much time to download each one to try out so I am wondering if anyone has come across anything good and useful. Preferably free but I don't mind paying or donating.

Ideas?

Check out http://usercake.com/ as well

Have you considered PHP GACL? http://phpgacl.sourceforge.net/

Here is the best one I found that goes into details as to whats going on

http://www.evolt.org/PHP-Login-System-with-Admin-Features