Drupal
Drupal is ready to go from the moment you download it. It even has an easy-to-use web installer! The built-in functionality, combined with dozens of freely available add-on modules, will enable features such as:
- Content Management Systems
- Blogs
- Collaborative authoring environments
- Forums
- Peer-to-peer networking
- Newsletters
- Podcasting
- Picture galleries
- File uploads and downloads
and much more.
Drupal is open-source software distributed under the GPL ("General Public License") and is maintained and developed by a community of thousands of users and developers. Drupal is free to download and use.