XWiki

XWiki is a WikiWiki clone written in  which supports many popular features of other wikis like:
 * Wiki syntax (uses Radeox engine)
 * Content management (view/edit/preview/save)
 * 
 * Attachments
 * Rights management
 * Full-text search

It also has many advanced features that many other wiki engines lack:
 * Document templates to ease creation of common documents
 * Relational Database storage using Hibernate
 * Design engine for Meta-Data and Forms
 * In-place (inline) editing of form information in pages
 * Powerful programming  in documents (Velocity or Groovy)
 * Search API for more detailed searching in the Meta-Data
 * Plugin system in Java
 * Scalability and performance using J2EE
 * Complete Skin System (templates content as well as  (CSS))
 *  output and display of external RSS feeds
 * Multilingual capabilities
 * XML/RPC Remote API
 * Portlet integration
 * Integrated statistics
 * PDF export
 * WYSIWYG HTML editing

Headquarted in , France, is also a wiki farm.