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:
http://jena.apache.org/
Joseki: The Jena RDF Server.
Joseki is a server for publishing RDF models on the web. Models have URLs and they can be access by HTTP GET. Joseki is part of the Jena RDF framework.
Jena has moved to Apache: http://jena.apache.org/
Joseki is replaced by Apache Jena Fuseki.
The D2RQ API provides access to relational database content from within the Jena and Sesame RDF frameworks. D2R Server is a Semantic Web server and SPARQL endpoint based on D2RQ. Both use a declarative language for mapping database schemata to RDF.
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The Semantic Web implementation using native xml database as backend storage. A SPARQL java compiler to XQuery using Jena. There are XQuery scripts for native xml database Sedna(http://modis.ispras.ru/sedna/).
A metadata schema registry server in Perl/C (based on RDF and Sparql/Redland), alongside a GUI client in Java/SWT with Jena for searching, browsing and creating application profiles, schemas and element sets describing resources in Dublin Core and LOM.
D2R MAP is a declarative language to describe mappings between relational database schemata and OWL ontologies. This D2R processor implements the D2R mapping language and exports data from a relational database as RDF, N3, N-TRIPLES or as Jena models.