1)   NuSphere PhpED 4.5.1
NuSphere PhpED IDE is a professional integrated development environment intended mostly for php, HTML, XML, CSS. Robust code editor, powerful php debugger, profiler and publisher – all in one.

 2)   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.

 3)   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.

 4)   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.