KAON - The Karlsruhe Ontology and Semantic Web Tool Suite

Ontomat is a framework which supports plugins for creating metadata tool. The current set of tools supports annotating, ontology and metadata editing, database adapter and others. It uses an idea called CREAM for annotation of data. The REVERSE package has been designed to integrate databases into the Semantic Web. The KAON server runs on the JBoss application server and Hypersonic or DB2 backend.

CREAM Paper:
http://www.aifb.uni-karlsruhe.de/WBS/sha/papers/kcap2001-annotate-sub.pdf

The server and other tools are available at:
http://kaon.aifb.uni-karlsruhe.de/