Drupal

From the site:

"Drupal is a free software package that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website. Tens of thousands of people and organizations have used Drupal to power scores of different web sites, including * Community web portals * Discussion sites * Corporate web sites * Intranet applications * Personal web sites or blogs * Aficionado sites * E-commerce applications * Resource directories * Social Networking sites"

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