It's not as application-heavy as a lot of other platforms, but there are definitely some great applications built on top of .NET. If you're looking for a CMS,

It's not as application-heavy as a lot of other platforms, but there are definitely some great applications built on top of .NET. If you're looking for a CMS, you'd be hard-pressed to find a better open-source CMS that runs on ASP.NET than Umbraco.