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If you are interested in developing search engine friendly Web sites with a content management system, you should be taking a close look at the open-source Drupal CMS. Drupal is a free and open source content management system (CMS) and content management framework (CMF) written in PHP and distributed under the GNU General Public License. It is used as a back end system for at least 1.5% of all websites worldwide ranging from personal blogs to corporate, political, and government sites including whitehouse.gov and data.gov.uk. It is also used for knowledge management and business collaboration.