phpDesigner 8
phpDesigner 8 is a fast PHP IDE and PHP editor with built-in HTML5 -, CSS3 - and JavaScript editors boosted with features to help you create amazing websites.

PHP, SQL, HTML - parser, debugger, code formatter, outline view, templates. Built on top of the powerful Eclipse development platform (www.eclipse.org).

Dev-PHP is a full-featured Windows Integrated Development Environment for PHP. It has many cool features, like Function browsing and full integration with the PHP parser and the PHP-GTK library.

tsWebEditor is a powerful php editor and html editor which you can also use as a simple text editor. It displays the source code colored (syntax highlight), parameter hint for functions, code completion (php, javascript, asp, html), code browser, php syntax and error check, help, css assistant, html tag editor, html syntax checker, etc.

Maguma Open Studio
A PHP IDE that includes features for class browsing, ftp support, snippets, debugging and project management. The Open Source version of Maguma Studio.

Arisesoft Winsyntax
Arisesoft Winsyntax is a free PHP-code editor with a fast syntax highlighting engine and the context PHP-help for professional scripting for Windows.

TemplateTamer is a tool for creating and maintaining a template based dynamic PHP web applications, with clearly and completely separated code from the html design. Free edition can be used as long as there is a link to the TemplateTamer web on every page