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.
Seagull is a mature OOP framework for building web, command line and GUI applications. Licensed under BSD, the project allows PHP developers to easily integrate and manage code resources, and build complex applications quickly.
The Horde Application Framework is a general-purpose web application framework in PHP, providing classes for dealing with preferences, compression, browser detection, connection tracking, MIME handling, and more.
A Secure and Modular PHP Framework that uses XML-RPC and HTTPS for remote calls. It uses the Smarty Template Engine to implement the admin part that has MySQL and multilanguage support. It has its own apache+php+mod_ssl to increase the security.
WTF is not a Wiki engine, although it can be used as one. It is actually a generic web content management engine allowing you to create web documents easily from the comfort of your browser. If you must compare it to something, consider it a cross between a Blog, a Wiki, and a forum.
Phrame is a web development platform for PHP based on the design of Jakarta Struts. Phrame provides your basic Model-View-Controller architecture, and also takes a step further adding standard components such as HashMap?, ArrayList?, Stack, ListIterator?, Object and more...