Microsoft Web Platform Installer (Web PI) is a free tool that makes it simple to download, install and keep up-to-date with the latest components of the Microsoft Web Platform, including Internet Information Services (IIS), SQL Server Express, .NET Framework and Visual Web Developer. In addition, install popular open source ASP.NET and PHP web apps with the Web PI. Get Microsoft Web Platform Installer and don’t forget to check out the Windows Web App Gallery, a simple way to find and install popular and free open source ASP.NET and PHP web applications for Windows.