The Liquicode User Management and Operations System (LUMOS), is a PHP framework for user account management for websites. Features include login, logout, register, modify, remember me, user lists, etc. Highly customizable and well documented.
very good project, thanks!
I started using this quite a ways back, simply because the authentication and user management portion of the project I was working on wasn't priority, and LUMOS did most of what I needed already. Two thumbs up to Verminox for putting together a solid framework.