Personally, I don't have a clue, however, doing a quick search using google did bring up the following
It is hard to determine which wiki engines are the most popular, although a list of leading candidates might include UseMod, TWiki, MoinMoin, PmWiki and MediaWiki (Google trend history comparison). A list of some of those available is included below, and another can be found at Wiki:WikiEngines.
Some wiki software is not intended for collaborative work, but for either content management or for personal information organising. Examples are AcroWiki or wikipad for Palm OS, Tomboy and Zim Wiki for Linux, ConnectedText and wikidPad for Windows, and ZuluPad for Mac OS X and Windows.
Quoted from Wikipedia