Jena is Java toolkit for developing semantic Web applications. It includes an RDF API, ARP, an RDF parser used for the W3C semantics Web sandbox, RDQL , and a DAML API.
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.
Open source Java-based framework built by HP Labs for building RDF-based Semantic Web applications.