Freshmeat page: http://freshmeat.net/projects/kwikwiki/
KwikWiki is a Java 1.4 based wiki. It's licensed under the GPL although I haven't got around to persuading Subversion> and Ant> to embed the appropriate headers in all the source code. It works quite nicely as a personal information system or in small groups. Being a traditional wiki it has no security. KwikWiki also has a fast and scalable full-text search functionality that does things like show all the pages which are related to the current page.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!