Contenido is an open source content management system based on PHP and MySQL.
http://www.contenido.org/
Content Management System · Open Source
Get access to data on 28,768 websites that are Contenido Customers. We know of 8,630 live websites using Contenido and an additional 20,138 sites that used Contenido historically and 691 websites in the United States.
Get a list of 28,768 websites using Contenido which includes location information, hosting data, contact details, 12,670 currently live websites which includes 4,040 domains that redirect to sites in the list. 20,138 sites that used this technology previously and 691 websites in the United States currently using Contenido.