1.umbraco
Its written in csharp on .net platform.Its a
content management platform.Its easy use,its user
interface is great to use.try it.learn more
about it and download at-
yetanotherforum.net

2.DotShoppingCart
DotShoppingCart is a complete CMS (Content Management System)
and ecommerce open source solution. Completely rewritten in V2,
it now contains a CMS framework and the shopping cart has become
a module of the CMS. The integrated CMS modules include blog,
news, RSS feeds, RSS Viewer, FAQ, online help, forums etc.
Visit the DotShoppingCart Web Site to download.

you will find lots of application details
in microsoft website.