Why We're Using Drupal!
Drupal is a free and open source Content Management System (CMS) written in PHP and distributed under the GNU General Public License. Features include the ability to register and maintain individual user accounts within a flexible and rich permission / privilege system, create and manage menus, RSS-feeds, customize page layout, perform logging, and administer the system. Drupal was also designed to allow new features and custom behavior to be added to extend Drupal's core capabilities. This is done via installation of contrib modules created and contributed to the project by open source community members. Dries Buytaert is the founder and lead of the Drupal CMS.
Security
Since early in the project's history, Drupal has adopted a full transparent policy towards security. The Drupal project's transparent approach is generally considered superior to the alternative—security through obscurity. A dedicated security team has a transparent and methodical process to review any reported issue—whether in Drupal core or contrib. If in core, a trusted core contributor is tasked to implement a fix in an expedited fashion, followed by re-review by the security team. If in contrib, the module maintainer is asked to implement the fix, followed by a review.
Community
Drupal has a large community of users and developers. The Drupal conference happens twice a year, alternating between North America and Europe. Drupalcon Szeged 2008, held in late August 2008, had an attendance of 500. Drupalcon Washington DC 2009, attracted over 1400 people. In September 2009, the conference was held in Paris, France, and in 2010 it will come to San Francisco.
There are a number of active Drupal forums, mailing lists and discussion groups. Drupal also maintains several IRC channels on the Freenode network.
There are over 20 national communities around drupal.org offering language-specific support.
High-Profile Websites Built Using Drupal!
Ordered by the relative amount of traffic, as reported by Compete.com:
* Whitehouse.gov
* FastCompany.com
* Economist.com
* Ubuntu.com
* TNR.com, the online home of The New Republic
* Twit.tv, Leo Laporte's netcast network.
* WFP.org, the website of the United Nations World Food Programme

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