ASP.NET CMS from Telerik.
http://www.sitefinity.com/
Content Management System · Enterprise
Get access to data on 4,892,698 websites that are Progress Sitefinity Customers. We know of 1,229,379 live websites using Progress Sitefinity and an additional 3,663,319 sites that used Progress Sitefinity historically and 743,599 websites in the United States.
Get a list of 4,892,698 websites using Progress Sitefinity which includes location information, hosting data, contact details, 1,229,379 currently live websites and an additional 46,966 domains that redirect to sites in this list. 3,663,319 sites that used this technology previously and 743,599 websites in the United States currently using Progress Sitefinity.