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Wikipedia's underlying open source wiki engine.
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Feature-rich implementation with support for various databases.
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A light PHP/MySQL wiki engine with archived history, search, admin panel and skins (released under proprietary Particle Soft End User Licence).
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A simple-to-install system which allows password protection and organization of pages into groups (GPL).
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A full featured, multilingual Wiki/CMS/Groupware written in PHP. [Open Source, LGPL]
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Small, lightweight, handy, expandable, multilingual Wiki-engine based on Wakka Wiki. WYSIWYG editor, easy installer, many localizations, email notification on changes/comments, several cache levels, design themes (skins) support, XHTML compliance, page rights (ACLs), page comments.
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Wikepage is an easy to use and small dual-mode wiki engine that can act as wiki sites and personal homepages.
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Wiki open source basé sur wakkawiki. Amélioré et adapté en français (compatibilité XHTML 1.0 et CSS) par Charles Nepote et David Delon. France.
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A free PHP/MySQL wiki engine based on forked code from WakkaWiki, with a number of features beyond the original Wakka, including a GUI page editor, advanced syntax highlighting and mindmap support. Released under GPL.
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A PHP script that runs wiki sites.
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Open source wiki engine written in PHP for the Midgard Content Management System.
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Implementation with MySQL backend for use on sites hosted by SourceForge.