ASP.NET CMS from Telerik.
http://www.sitefinity.com/
Content Management System · Enterprise
Get access to data on 5,141,210 websites that are Progress Sitefinity Customers. We know of 1,091,082 live websites using Progress Sitefinity and an additional 4,050,128 sites that used Progress Sitefinity historically and 683,925 websites in the United States.
Get a list of 5,141,210 websites using Progress Sitefinity which includes location information, hosting data, contact details, 1,091,082 currently live websites and an additional 45,230 domains that redirect to sites in this list. 4,050,128 sites that used this technology previously and 683,925 websites in the United States currently using Progress Sitefinity.