DotNetNuke :DNN Platform (formerly "DotNetNuke Community Edition" content management system) is open source software that is intended to allow management of websites without much technical knowledge, and to be extensible through a large number of third-party apps to provide functionality not included in the DNN core modules
Umbraco :Umbraco is an open source content management system (CMS) platform for publishing content on the World Wide Web and intranets. It is written in C# and deployed on Microsoft based infrastructure.
Sitefinity :The Sitefinity CMS’ ultimate aim is to reduce the complexity in web development. Pair that with our endeavor to reduce complexity in user experience, and you have a winner as far as CMS’ go. Suyati’s strengths ensure contemporary, rapid and top-class, end-to-end web solutions. They help you best manage the content flow – from creation to publishing.