Laravel - A PHP Framework For Web Artisans
CodeIgniter - A Fully Baked PHP Framework
Zend - Running PHP web servers? Zend by Perforce delivers a leading enterprise PHP platform, long-term PHP support that extends beyond community offerings, PHP training and certification, and more.
CakePHP - The Rapid Development Framework for PHP
Django - The Web framework for perfectionists with deadlines
Symfony - A PHP full-stack web framework