Why Drupal? Flexibility.
Drupal is free software released under the GNU GPL. This license maximizes everyone's freedoms. There are no fees or proprietary vendor lock-in.
Drupal attracts a worldwide network of developers who create and share an ever growing collection of industry-leading solutions
Thousands of freely-available themes and optional features are quickly and easily installed. The flexible codebase supports rapid development of custom features.
Organizations using Drupal include the US White House, The Economist Magazine, Fast Company, Amherst College, Portland State University, University of Berkeley, Amnesty International, World Wildlife Fund, Sony Music, Warner Brothers Music, and many more.