XenForo brings a fresh outlook to forum software.
http://xenforo.com/
Content Management System · Forum Software
Get access to data on 64,906 websites that are XenForo Customers. We know of 16,813 live websites using XenForo and an additional 48,093 sites that used XenForo historically and 8,831 websites in the United States.
Get a list of 64,906 websites using XenForo which includes location information, hosting data, contact details, 36,869 currently live websites which includes 20,056 domains that redirect to sites in the list. 48,093 sites that used this technology previously and 8,831 websites in the United States currently using XenForo.