Drupal, one of the largest open source projects in the world, is a content management system and application framework that powers millions of websites, web services, and mobile applications. Individuals and organizations in every sector use Drupal for everything from simple blogs and micro-sites, to complex intranets and private internal applications, to some of the largest sites on the web, including several top 100 properties.
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Opensource.com – michaelemeyers
Supporting Open Source.