1)   Zend Studio 5.5
Zend Studio is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle.

 2)   Zend Studio for Linux 5.5
Zend Studio is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle.

 3)   Zend Studio for Mac 5.5
Zend Studio is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle.