DokuWiki
Linux.com has a review of DocuWiki. I've used/seen DocuWiki in the past, but for some reason or another I've never mentioned it here at CMS Report. DocuWiki runs on a flat file system (no database required) and I've known people to choose it over others due to its easy to use ACL (access control list).
Created as a simple solution for managing documentation, DokuWiki has evolved into a powerful and flexible wiki suitable for most tasks involving collaborative editing. DokuWiki doesn't use a database back end (all pages are stored as plain text files), which makes it easy to install and maintain. Its access control list feature offers a user-friendly and flexible mechanism for restricting access to certain pages and namespaces. You can also extend DokuWiki's default functionality using plugins, and there are hundreds of plugins to choose from.
If MediaWiki isn't your choice for a Wiki-only application, DocuWiki would be a worthy alternative.









Wiki is the logical conclusion...
Out of almost 300 CMS I've reviewed in the past 3 months only TikiWiki and Enano have it right - the final result of all that chit-chatting in forums, blogs, and comments to articles is Wiki; yet just 2 CMSs seem to have it right. (I'm talking about Wiki IS the correct solution to CMS and not a forgotten add-on by a 3rd party)
DokuWiki is a fantastic Wiki, except the crazy idea of using the SLOW file management system of your hosting provider instead of mySQL which is 1,000 times as fast to retrieve data.
DokuWiki needs to stop acting like Apple (We will not be Microsoft/PC compatible) and start using a database instead of the S-L-O-W file structure of your hosting provider.
(Each Wiki page has a separate file folder on the hosting site)
But I like the concept of DokuWiki and hope they grow up one day.
MySQL isn't faster (for the most part)
I have to disagree with the "databases are faster" statement ... unless you run some tests and let the results talk ;-).
MySQL isn't faster (for the most part). Like MediaWiki DokuWiki caches the pages, and always serves the cached page instead of rendering it each and every time it is viewed!
The only real drawback of a flat file driven Wiki is that the search, and the processing of meta data _is_ indeed slow compared to a database driven system (though, DokuWiki holds page metadata as serialized php arrays which speeds up its retreaval).
However, there are plans to move these parts into a sqlite database, once PHP5 is more available/used.