WebMatrix is a free download of the Web development stack that makes it easy to build websites either ground-up or using templates. If you’re writing classic ASP or open source web applications (including PHP), or whether you’re new to building websites, WebMatrix gives you a flexible array of tools to build websites quickly. The WebMatrix download size is small at about 15Mb, and takes about 5 minutes to install. WebMatrix also integrates the Web Application Gallery and Web Application Installer from Microsoft, enabling developers who use PHP, MySQL or other web development components.
WebMatrix also supports HTML5. To download, please go to http://www.microsoft.com/web/webmatrix/.