A powerful wiki in JavaLanguage. http://www.xwiki.org/
- Wiki syntax (uses it's own polyglot rendering engine, see http://rendering.xwiki.org)
- Content management (view/edit/preview/save)
- VersionControl
- 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.
- RelationalDatabase storage using Hibernate.
- Design Engine for Meta-Data and Forms.
- In-place (inline) editing of form information in pages.
- Powerful programming API in documents ([Velocity>http://jakarta.apache.org/velocity] or [Groovy>http://groovy.codehaus.org])
- Search API for more detailed searching in the Meta-Data.
- Plugin System in Java.
- Plugin compatibility layer in perl with some TwikiClone plugins.
- Scalability and Performance using J2EE.
- Complete Skin System (templates content as well as CSS).
- ReallySimpleSyndication output and display of external RSS feeds
- Multi-Lingual capabilities
- REST and XML/RPC Remote API
- Portlet Integration
- Integrated Statistics
- PDF Export
- WYSIWYG HTML Editing
Before building XWiki, I have been a long time user of TWiki which has been a great source of inspiration for XWiki. I'm also very impressed by the work done on SnipSnap (and Radeox, which is used in XWiki) as well as AtlassianConfluence (although I regret it is not open-source). -- LudovicDubost in 2003