MediaWiki
From Tech-Help
MediaWiki is a server-based software package for creating wikis. It is Open Source and free. It uses MySQL and PHP on the server.
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Download
Software is available at: http://www.mediawiki.org/wiki/Download
Current Version: 1.10 – Requires PHP 5
Legacy Version 1.6 – The last version to use with PHP 4. If your server does not have PHP 5 available to you, you must use this version.
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