Webasyst is a PHP framework (a platform) for developing web-based multi-user apps with a backend and a frontend. It offers a ready-to-use system for user authorization, access rights and routing setup, website creation, sleek CSS framework for fast UI design. The framework is great for creating secure web apps for businesses.

lINlOUT is a PHP / AJAX / MySQL based authorization library that gives registration and login / logout featureas to a web site. It is completely multilanguage and template (smarty) based. It is an authentication users tool, that supplies a rule to run a registerd users area.Features of lINlOUT:- multilanguage- written in PHP- Open Source- administration interface, with password access, ...

wawp, set of tools for web authentication and authorization. Wawp use php and mysql for login (also over SSL), logout and restrict web access to authorized users and/or groups.The restrictions can be organized per-directory, per-file or both.