"Drupal is a modular content management/discussion/community engine written in PHP. Its features include (but are not limited to) discussion forums, Web-based administration, theme support, a submission queue and content rating, content versioning, taxonomy support, user management with a fine-grained permission system based on user roles (groups), error logging, a weblog/journal/diary module, support for content syndication (RSS/RDF import and export), locale support, and much more. "