Orchard CMS
Orchard is a free, open source, community-focused content management system written in ASP.NET platform using the ASP.NET MVC framework. Its vision is to create shared components for building ASP.NET applications and extensions, and specific applications that leverage these components to meet the needs of end-users, scripters, and developers.
Orchard is delivered as part of the ASP.NET Open Source Gallery under the Outercurve Foundation. It is licensed under a New BSD license, which is approved by the Open Source Initiative (OSI).
This shows you some of the power and extensibility of Orchard CMS, and why we have chosen to build all our client websites using this .NET content management system.

