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Features and functions improved in this release include modules, plugins, newsletters, browser support, calendars, overall interface and language, and many more.
For the list of major enhancements since Tiki2, please see: http://doc.tikiwiki.org/Tiki3
TikiWiki CMS/Groupware is a full-featured, tightly integrated, open source, multilingual, all-in-one Wiki+CMS+Groupware, written in PHP and actively developed by a very large international community. Major features include articles, forums, newsletters, blogs, a file/image gallery, a wiki, bug & issue tracker (form generator), a calendar, RSS feeds, a category system, tags, an advanced user, group and permission system and more.
About Tiki: http://tikiwiki.org/