Drupal

Drupal allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website. It helps to build 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.

The built-in functionality, combined with dozens of freely available add-on modules, will enable features such as: Electronic commerce, Blogs, Collaborative authoring environments, Forums, Peer-to-peer networking, Newsletters, Podcasting, Picture galleries, File uploads and downloads.