[link|http://veryquickwiki.sourceforge.net/links.html|VQWiki]. Cleaner, simpler, interface than TWiki. You can see a sample [link|http://www.croninsolutions.com/veryquickwiki/wiki/jsp/|here]. JSP, but you can drop it in as a .war and go. No built-in security, though, if you need that. I use it with IIS and Tomcat.