phpCodeGenie is a code writer/generator for PHP/MySQL applications. It builds numerous forms and scripts, from your databsae tables. Just design your database and let phpCodeGenie do the coding for you.
ADOdb is a fast, easy to use, popular database abstraction layer for PHP. It allows the same code to be used when accessing a wide range of databases. It has been actively maintained since 2000 by the project's founder and numerous community contributors.
phpHtmlLib is now an application development framework for developing OOP style web applications in PHP. The application framework supports an MVC style architecture, Ajaxable and Cacheable interfaces for developing rich client web applications.