CMS using ASP.NET

http://www.yetanotherforum.net/

Yet Another Forum.net is an open source discussion forum or bulletin board system for web sites running ASP.NET. It is ASP.NET based with an MSSQL backend database.

https://sourceforge.net/projects/websharp/

Websharp is a lightweight application framework for Microsoft dotNet.

https://umbraco.com/

Umbraco is a Content Management Platform written in c# on the Microsoft. NET platform. It's fast, flexible and with a user interface that makes it a charm to use.

https://sourceforge.net/projects/thufir/

http://nvelocity.sourceforge.net/

NVelocity is a. Net-based template engine. It permits anyone to use the simple yet powerful template language to reference objects defined in .Net code.

https://sourceforge.net/projects/nkcms/

nkCMS is a CMS system written for ASP.NET and MSDE/MS SQL-Server. It will provide a free ASP.NET alternative to other cms written for php/jsp/cf.

http://ndcms-net.sourceforge.net/

https://www.mojoportal.com/

mojoPortal, is an open source web site framework and content management system written in C# that runs under ASP.NET on Windows or under Mono on Linux or Mac OS X.

https://www.team-mediaportal.com/

http://mavnet.sourceforge.net/