Drupal
The Content Management System in Brief:
CMS Original Developer: Dries Buytaert
Operation System: Cross-platform
Main Use: CMS & Blog software
License: GNU General Public License
Developers' Description:
Drupal is a free software package that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website. Tens of thousands of people and organizations have used Drupal to power scores of different web sites, including:
Community web portals
Discussion sites
Corporate web sites
Intranet applications
Personal web sites or blogs
Aficionado sites
E-commerce applications
Resource directories
Social Networking sites
Vox Populi (taken from Wikipedia):
Drupal is a free software modular content management framework, content management system and blogging engine which was originally written by Dries Buytaert as a bulletin board system. Today, it is used by many high-traffic websites, including The Onion, Spread Firefox (CivicSpace, see below), Ourmedia, KernelTrap, and the Defective by Design campaign. It is particularly popular for building online communities, and has the tag line "Community plumbing". Drupal is written in PHP.