A plugin to build user communities all around WordPress.
http://wordpress.org/extend/plugins/alkivia/
Content Management System
Get access to data on 66,367 websites that are Alkiva Open Community Customers. We know of 10,770 live websites using Alkiva Open Community and an additional 55,597 sites that used Alkiva Open Community historically and 4,477 websites in the United States.
Get a list of 66,367 websites using Alkiva Open Community which includes location information, hosting data, contact details, 21,203 currently live websites which includes 10,433 domains that redirect to sites in the list. 55,597 sites that used this technology previously and 4,477 websites in the United States currently using Alkiva Open Community.