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PBWorks. Wagn-Structured Wiki on Rails. Wiki: Welcome Visitors. PBwiki: Free Collaboration, Intranet, Extranet, Education, Business Wiki. ToraToraWiki. Hackpad. Wikidot - Free and Pro Wiki Hosting. Piggydb - A knowledge creation system. XWiki, the best way to organize information. XWiki - Open Source Wiki and Content-Oriented Application Platform (Main.WebHome) - XWiki.org.