P4A is probably the best PHP5 RAD and object oriented PHP framework for building event-driven stateful web applications. It is based on Zend Framework and features tableless HTML, multiple databases, accesskey support, auto data type recognition, transpar
Xaraya is a cutting edge open source framework (written in PHP) on which developers can create sophisticated web applications and designers enjoy considerable flexibility.
Kumbia es un web framework libre escrito en PHP5
Akelos is a PHP framework for developing database-backed web applications according to the Model-View-Controller pattern.
ajax based framework for php5 developers