JetBrains PhpStorm is a commercial, cross-platform IDE for PHP built on JetBrains' IntelliJ IDEA platform.

CodeLobster PHP Edition is a free portable handy and easy-in-use code editor that is primarily intended for quick and easy creation and editing of PHP, HTML.

PhpED is a PHP IDE integrated development environment for developing web sites using PHP, HTML, Perl, JScript and CSS.

Koding is a development environment automation platform.

Aksi IDE is an editor for PHP.

phpDesigner is a PHP IDE and PHP editor with built-in HTML5, CSS3 and JavaScript editors.