Apache Jena is an open-source data framework for Java. It provides an API to extract data from and write to RDF graphs.
Jena was originally developed at HP Labs in the United Kingdom. It was then moved as an Apache Foundation project in 2009.
Triplestore / RDF
SPARQL Datalog
http://jena.apache.org/
https://github.com/apache/jena
http://jena.apache.org/documentation/index.html
@ApacheJena
HP Labs
GB
2000
Open Source
Java
All OS with Java VM
Apache v2
https://en.wikipedia.org/wiki/Apache_Jena