Admidio is a free open source user management system for websites
Kimai is a web-based multi-user time-tracking application
Admin interface for managing users, roles, and permissions
Modern PHP user login and management framework++
Provides user management for your Symfony project
Authorization, Authentication and User Management library
The world's leading content management systems (CMS) written in PHP
Manage your organization online
Award-winning lightweight Open Source Content Management System (CMS)
Easy to use, but powerful deployment tool using FTP and/or SFTP/SCP
Login with Multiple Hierarchies of User and Members!
Account management PHP Script with a software infracstructure
A ready-to-use CodeIgniter skeleton with tons of new features
Secure login system for php frameworks, applications ansd sites
FrequencyCMS is a a light-weight, free and open source CMS.
Simple user login management in php with sessions.
A login/creation system made in PHP. Also known as SMLS.