Free PHP IDE
PHPeclipse
PHP, SQL, HTML - parser, debugger, code formatter, outline view, templates. Built on top of the powerful Eclipse development platform (www.eclipse.org).
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.
PHP Designer 2005
The development environment in PHP Designer 2005 combines many powerful features such as customizable syntax schemes for PHP, HTML, XHTML, CSS, Perl, C#, JavaScript, VB, Java and SQL (Ingres, Interbase, MSSQL, MySQL, Oracle, Sybase and Standard SQL), a class/include browser, test and debug your scripts with the PHP interpreter, integration of the PHP manual, parameter hint, auto indent of brackets, automatic close brackets, access to common code/script libraries all combined in this one unique program.
tsWebEditor
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.
KPHPDevelop
KPHPDevelop is a PHP IDE for KDE. See the website for more detailes.
Dev-PHP IDE
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.
PHP Coder
PHP Coder is an IDE (Integrated Development Environment) especially developped for PHP programmers.
TemplateTamer
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
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.