Wiki
WiKi Tools
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PBWiki
: hosted by pbwiki.com, no need to install.
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Mediawiki
: open source software package originally written for Wikipedia.
Requirements: PHP, MySQL (PostgreSQL), Web Server
Installation manual:
http://meta.wikimedia.org/wiki/Help:Installation
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A comparison of Wiki Software:
http://en.wikipedia.org/wiki/Comparison_of_wiki_software