DotNetNuke alternatives

DotNetNuke
DotNetNuke is a Web Content Management Platform (or CMS) for Microsoft ASP.NET, powering over 700,000 production web sites worldwide. The flexible DotNetNuke open source CMS platform also functions as a web application development framework. Depending on your role within your organization, DotNetNuke provides powerful benefits to support your Web initiatives.
DotNetNuke alternatives are:
Drupal, Sharepoint, Joomla