Jena is Java toolkit for developing semantic web applications based on W3C recommendations for RDF and OWL. It provides an RDF API; ARP, an RDF parser; SPARQL, the W3C RDF query language; an OWL API; and rule-based inference for RDFS and OWL.
Jena is now an Apache project:
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Jena is excellent! Thanks.
very good project, thanks!
Great project! Very useful!
I use this every single day!
Can't live without it! It's fast and simple, integrates perfect with Windows (XP, Vista and 7).