DotNetNuke Community Edition is a leading free open-source content management system for ASP.NET websites.  With DotNetNuke, you can quickly and effectively deploy dynamic web applications with almost no technical knowledge, however if you are an ASP.NET developer, you can customize it in the way you want to fulfill your specific needs.  Whether you need to deploy a simple website or a feature-rich dynamic application, DotNetNuke cater your needs in the way you want.