Drupal

Drupal is one of the world’s three top most popular content management systems. Built upon well-proven PHP technologies, absolutely free, flexible and easily extendable, feature-rich and stable, this technology has become the engine for millions of websites worldwide, from small personal blogs to huge enterprise and news portals, complex web stores and social networks. Being as well one of the easiest systems to use and maintain for non-developers, Drupal is the technology of choice for dozens of thousands of developers and webmasters.