Drupal (Content Management System - CMS)
Purpose of Drupal
Drupal is a free and open source content management system.
A Content Management System is a set of tools that help to organize the flow of data in an organization and over the Internet.
Examples of Organizations Using Drupal CMS
Documentation
Drupal Handbooks: http://drupal.org/handbooks
Online Tutorials
Drupal Tutorials: http://drupal.org/handbook/customization/tutorials
Textbooks
Publication List: