|Drupal is a is database driven (MySQL and PostgreSQL) content management system, which supports pluggable modules that enable additional behaviors. It is considered to be an excellent platform for developers due to its clean code and extensibility, and it can also be used as a Web application framework.
The modules available for Drupal provide a wide assortment of features, for example:
The latest Drupal version can be downloaded from: http://drupal.org/project
Drupal forum can be found at: http://drupal.org/forum