Drupal.org - home of Drupal Content Management System

http://drupal.org/ is the home of Drupal content management system. This site is built using Drupal CMS as are other sites I've worked on. I highly recommend it.

If only I could work out more about customising themes! (need more spare time)

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Drupal.org is the official website of Drupal, an open source content management platform.

Equipped with a powerful blend of features, Drupal can support a variety of websites ranging from personal weblogs to large community-driven websites.
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visit http://www.drupal.org/ for more details