Platypus is a java-based wiki which uses Jena 2 (by way of Danny Ayers).

I downloaded the war and got it running. Note: Platypus required Tomcat 5 on my Mac.

One killer feature is global links, a hash of global names and links. That should save some time. Namespaces are designated in editing with a swebbish colon, as opposed to the usual multicasing. The most interesting aspect is the subject-predicate-object metadata, as well as editable N3 and RDF for each wiki page. Cool!