Jena Framework

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Jena Semantic Web Framework

Developer:	Hewlett-Packard
Latest release:	2.5.2 / January 18, 2007
OS:	Cross-platform
Use:	Semantic Web
License:	BSD-style license
Website:	http://jena.sourceforge.net/

Jena is an open source Semantic Web framework for Java. It provides an API to extract data from and write to RDF graphs. The graphs are represented as an abstract "model". A model can be sourced with data from files, databases, urls or a combination of these. Model can also be queried through SPARQL.
Jena is similar to Sesame (framework), however what sets it apart is that the framework also provides support for OWL (Web Ontology Language). The framework has various internal reasoners and also provides support for external reasoners through the DIG interface.
The Pellet reasoner (an open source Java OWL-DL reasoner) can be set up to work in Jena without using the DIG interface. This allows for improved speed and overcomes some of the limitations in the DIG protocol.

Jena supports serialisation of RDF graphs to:

a Relational Database
RDF/XML
Turtle
Notation 3

[edit] Joseki

Joseki is an RDF server. The goal of Joseki is to provide a HTTP interface to RDF data. It fully supports SPARQL for querying, but as of yet, it does not provide an update protocol.
The project is a sub-project of Jena and is developed as a J2EE application. Joseki can also be run standa-alone server as it ships preconfigured with the Jetty (web server).