Nanoweb is a modular Web server written in PHP. It is designed to be small, secure, and extensible. It is HTTP/1.1 compliant and has decent performance, CGI and FastCGI support, a nice configuration system, name-based virtual hosts, server side includes, authentication, gzip content encoding support, Apache combined format and MySQL logging, and many advanced features.
sTeam provides a technical platform which allows groups of students, lecturers, and any other groups to construct and arrange their individual and cooperative learning and working space. It consists of an object-oriented server connected to a database, and Web, Java, and other (FTP, SMTP, IRC, etc.) clients. The server is event-driven and manages all user objects as well as the communication between the connected clients. Features that were different from most other cooperation tools is the self-organisation and self-administration by the members within the virtual environment.
phpSecurePages is a PHP module to secure pages with a login name and password. It can handle multiple user groups (each with their own viewing rights), store data in a MySQL database or a configuration file, and be used to identify your Web site viewers. It also has multiple language support and optional IP-based access restrictions.