Drupal
Drupal is an open-source content management platform that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website. Other capabilities of the software include collaborative authoring, e-commerce, document management, blogs, discussion forums, photo galleries and web community features. Hundreds of additional modules have been developed to extend the core functionality of Drupal. They allow for an efficient way to add the latest web functionality to a Drupal installation with minimal customization of the core Drupal installation.