Drupal

Drupal is an open source CMS written in PHP, and is used for personal blogs as well as for corporate, political and government sites across the world. It is also known as a Web application framework. It is effective for knowledge management and business collaboration. Other features offered include user profiles management, user management, OpenID support, access statistics and logging, page layout customisation, books, comments, forums and polls. It also allows caching and feature throttling for better performance, systems administration, menu management, advanced search, RSS feeds and a feeds aggregator, support to workflow tools (triggers and actions), localisation built on top of gettext - the GNU internationalisation and localisation (i18n) library, auto update notifications for new versions of modules, and themes. Drupal 7 requires PHP 5.2.5 or higher. Drupal supports Web servers such as IIS, Lighttpd, Apache, Hiawatha, Cherokee or Nginx; and databases such as PostgreSQL, SQLite, MongoDB, MariaDB, MySQL, or Microsoft SQL Server.

Website: https://drupal.org/