Castor is a dynamic web site builder. It simplifies the development of PHP web applications. Several built-in modules are provided and to allow for very easy to write personal modules.   Code: PHP 4.0

Epesi is an open source lightweight PHP and AJAX based application framework for developing database driven appliations. It features support for custom built modules, expanding the horizons of what users can do within the framework.   Code: PHP 4.0

Tired of writing the same code for each project? Bitmeta is a php site framework with user authentication, global headers and footers, easy layout management and more ready for your next big web application.   Code: PHP 4.0

WCMF is a lightweight MDA approach to application development based on the MVC pattern. It allows to create any kind of PHP webapp, e.g. CRM, CMS from an UML model. It features an object persistence layer, a soap interface and standard views/controllers.   Code: PHP 4.0

Php On Trax (formerly Php On Rails) is a web-application and persistance framework that is based on Ruby on Rails and includes everything needed to create database-backed web-applications according to the Model-View-Control pattern of separation.   Code: PHP 4.0