VeryQuickWiki is another JSP-based Wiki. It's code is hosted at SourceForge, but the primary website appears to be http://www.vqwiki.org/. Martijn van der Kleijn is the lead developer.

The latest version is 2.7.91. Just drop-in the .war file. The design looks like it will make for a very usable approach for non-programmers. The main goal is to be small and simple. However, that's the reason why very quick wiki has less advanced features like other wikis.