HTML-Kit is a full-featured, highly customizable and free development environment that can be used to create, edit, validate, preview and publish web pages and scripts. Despite its name and the light download size, HTML-Kit is a multi-purpose tool that has support for several scripting and programming languages-including PHP. Mambosolutions offers a free plugin for HTML-Kit by Rick Kondro that adds a custom toolbar to the editor and allows you to easily add the Mambo code snippets and help you to create your own mambo templates.