Content management system and extranet. GPL

TribalCMS 5 is easy to use, allowing a low-budget or simple Web site to be built quickly, yet it is backed up with features that make it powerful enough for an enterprise-level intranet, extranet, or large Web site. It includes an author-publisher system, version control, audit trail, WYSIWYG editor, and Extranet functionality (based on users and groups). It includes many content types: Web pages, downloads, news, events, forums, adverts, hyperlinks; other types can be added. For developers, it can be used as a framework for advanced applications. Additional functionality is available in commercial editions.