Web Directory

» Confluence
   A professional wiki, written in J2EE, with enterprise features such as PDF export, page refactorings, tight email integration, RSS feeds, a full remote API in addition to all the normal wiki features.
   http://www.atlassian.com/software/confluence/

» Corendal Wiki
   An open source wiki for the enterprise. Integrates with Active Directory and uses a WYSIWYG rich text editor. Site contains downloads, documentation, and development information.
   http://www.corendal.com/products/corendal-wiki

» JOTWiki
   A full feature, yet easy to use J2E based wiki engine, without any dependencies.
   http://www.jotwiki.net/

» JSPWiki
   JSP-based wiki with optional versioning, licensed under GPL.
   http://www.jspwiki.org/

» XWiki
   A Wiki with skins, plugins, XML/RPC remote API, portlet integration, statistics, RSS feeds, PDF exporting, and WYSIWYG editing.
   http://www.xwiki.org