Php Frameworks

Zend                http://www.zend.com/en/
Code Igniter   http://codeigniter.com/
Yii                    http://www.yiiframework.com/
CakePHP        http://cakephp.org/
Symfony         http://symfony.com/
Silex                http://silex-project.org/
FuelPHP         http://fuelphp.com/
Kohana           http://kohanaframework.org/
ThinkPHP       http://www.thinkphp.cn/ (Chinese)
phpRaise        http://code.google.com/p/phpraise
Tlalokes          http://tlalokes.org