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http://wiki.splitbrain.org/wiki:dokuwiki
DokuWiki is a standards compliant, simple to use Wiki, mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups and small companies. It has a simple but powerful syntax which makes sure the datafiles remain readable outside the Wiki and eases the creation of structured texts. All data is stored in plain text files - no database is required.
http://wiki.splitbrain.org/wiki%3Afeatures
Can't decide if DokuWiki is right for you? Have a look at the Wiki Engine Comparison page