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Confluence - http://www.atlassian.com/software/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. |
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http://www.xwiki.org - http://www.xwiki.org
A Wiki with skins, plugins, XML/RPC remote API, portlet integration, statistics, RSS feeds, PDF exporting, and WYSIWYG editing. |
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http://www.jspwiki.org/ - http://www.jspwiki.org/
JSP-based wiki with optional versioning, licensed under GPL. |
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VeryQuickWiki - http://veryquickwiki.croninsolutions.com/
A deliberately lightweight JSP-based implementation. |
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http://www.jotwiki.net/ - http://www.jotwiki.net/
A full feature, yet easy to use J2E based wiki engine, without any dependencies. |