DotNetNuke

DotNetNuke is an open source web application framework ideal for creating, deploying and managing interactive web, intranet and extranet sites. DotNetNuke is designed to make it easy for administrators, content editors, developers, and designers to manage all aspects of their web assets. Wizards, content-sensitive help, and a well-researched user interface provide a superior user experience.

DotNetNuke can support multiple websites from a single application installation. In dividing administrative options between host level and individual site level, DotNetNuke allows administrators to manage an unlimited number of websites