Complete PHPDocs, directly from the source
CodeLite: an open source, cross platform C/C++/PHP and JavaScript IDE
A powerful HTML, C#, PHP editor for windows
Development of the project has been suspended
Tools to support the learning of the C programming language
PHP Support for GNU Emacs
W3C-like editor supporting HTML, JS, PHP and all web-freindly language
Facebook & Google Chat for eclipse in perfect camouflage. Enjoy