Tom Heath's Displacement Activities

A running list of applications built on top of the Jena Semantic Web framework from HP Labs:

• ACUITy, by GE Global Research
  
• An RDF Crawler, by Matt Biddulph
  
• Ginseng, from the University of Zurich
  
• PhotoStuff, from the University of Maryland
  
• AKTive WorkGroup Builder, from the University of Aberdeen
  
• Ingenta MetaStore
  
• Peruser
  
• FOAFaMaticMark2, by Leigh Dodds
  
• OCRA: the Ontology CRAwler, from the University of Maryland
  
• SemanLink
  
• SWAN: Semantic Web Application in Neuromedicine, by Alzforum and MIND Informatics (related paper)
  
• TopBraid Composer
  
• XMLArmyKnife - SPARQL Query Service, by Leigh Dodds
  

If you're interested in a more code-centric view, this query on Google Code Search will show you applications that import Jena; returns about 200 results as of October 2006.