My Web Pages Starter Kit is a simple yet powerful file based content management system for small websites.

Dropthings – Ajax Web Portal

Ajax Web Portal built on Linq, Workflow Foundation and ASP.NET AJAX. Code is in Visual Studio 2008 using .NET 3.0 and .NET 3.5.

Umbraco

umbraco is a Content Management Platform (CMS) written in c# on the Microsoft .NET platform. It’s fast, flexible and with a user interface that makes it a charm to use. No limits in design/layout

N2 CMS

A free open source CMS for ASP.NET 2.0. N2 combines the programmability of object oriented programming with the convenience of having database storage, structure and edit interface handled.

JMDCMS Content Management System

JMDCMS is a powerfull module based Content Management System. Written in ASP.net and C# with SQL Server as database. Flexible automatic 3Col, 2Col, 1Col layout.

MVCMS.Net

The MVCMS.Net project aims to become both a showcase for the new Asp.Net MVC platform as well as a viable open-source content management system.

Blog MVC.NET

A Blog Engine based on ASP.NET MVC framework. It seems several of these projects have begun, with little or no action.

HydrogenCMS

A minimalist CMS experiment using asp.net mvc.

BlogEngine

is an open source .NET blogging project that was born out of desire for a better blog platform. A blog platform with less complexity, easy customization, and one that takes advantage of the latest .NET features.