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Drupal is a modular and very flexible content management system (CMS)
It is an open source tool, under the GNU/GPL licence, written in PHP, developed and maintained by a very active community of users, Drupal is without any doubt the leader in the industry of the CMS, distinguished by the quality of it’s source code and it’s generated-page HTML code, the strict accomplishment with the www standards plus an special emphasis on the usability and consistency of the whole system
The Drupal’s design is suitable for the construction and management of internet communities. Nevertheless its flexibility and adaptability as well as the big amount of additional modules available, makes Drupal the perfect choice for many types of web products.
The main development and coordination site of Drupal is http://drupal.org in which some thousand of users around the world participate actively.