Codereview is a project mainly written in PHP, it's free.
CakePHP is a rapid development framework for PHP which uses commonly known design patterns like Active Record, Association Data Mapping, Front Controller and MVC. Our primary goal is to provide a structured framework that enables PHP users at all levels to rapidly develop robust web applications, without any loss to flexibility.
The Cake Software Foundation - promoting development related to CakePHP http://cakefoundation.org/
CakePHP - the rapid development PHP framework http://www.cakephp.org
Cookbook - user documentation for learning about CakePHP http://book.cakephp.org
API - quick reference to CakePHP http://api.cakephp.org
The Bakery - everything CakePHP http://bakery.cakephp.org
The Show - live and archived podcasts about CakePHP and more http://live.cakephp.org
CakePHP TV - screen casts from events and video tutorials http://tv.cakephp.org
CakePHP Google Group - community mailing list and forum http://groups.google.com/group/cake-php
irc://irc.freenode.net/cakephp