XWiki is a WikiWiki clone written in Java that supports many popular features of other Wikis like the Wiki syntax, version control, attachments, security, and searching, but also many advanced features like templates, database and dynamic development using scripting languages (Velocity, Groovy, Ruby, Python, PHP, and more), an extension system and skinability, J2EE scalability, an XML/RPC remote API, statistics, RSS feeds, PDF exporting, WYSIWYG editing, an Office viewer and importer, and a lot more.
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Changes

There are fewer new features in this release, and most of the changes are internal. The highlights of this release are a preview version of the new class editor to be used in the Application Within Minutes designer, new Debian packages, a few extension manager improvements, LDAP improvements, and improvements in uploading and downloading attachments, especially when filesystem storage is enabled.

URL: XWiki - Open Source Wiki and Content-Oriented Application Platform (Main.WebHome) - XWiki.org