Developed by Zend and IBM, an IDE which focuses on the development of complex PHP-driven web applications. The Eclipse site also offers IDEs for other other platforms such as Java. [Commercial]

A full featured PHP IDE for Windows. It has code insight, code completion, syntax-highlighting, integrated debugger, code browser, keyboard templates. [Commercial]

IDE offering editing tools including full support for PHP 5.2, syntax highlighters, nested code completion, code tips displayed as you type, a project manager, code snippets, and built-in code libraries. [Commercial]

PHP IDE with built in debugger, CodeBrowser, FTP client and MySQL manager. Features, downloads, issue tracker and forum available. [Freeware]

A full-featured IDE for PHP on Windows. Features include Function browsing and full integration of the PHP parser and the PHP-GTK library. [Open source, GPL]

An integrated development environment (IDE) for PHP for Windows and Linux. It supports PHP software development on all stages including coding, debugging, profiling and publishing. By NuSphere. [Commercial]

A cross-platform, multi-language Integrated Development Environment for PHP and Python built on top of Eclipse Platform.

An easy-to-use PHP IDE for Windows (98+). Has an internal HTTP-server and Debugger to run, test and debug PHP scripts. Website also offers other commercial charting software. [Shareware]