And a good candidate would be tiddlywiki. One could start with their Tiddly Web Adapter plugin and modify it to use the HIVE API instead of the tiddlyweb server.

I am coming from little knowledge of what a good wiki should be able to do, so plugging into an existing one makes sense and saves re-inventing the wheel. This would not need a server, other than the Hive API, of course.