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. It was then moved as an Apache Foundation project in 2009.
Triplestore / RDF
SPARQL
http://jena.apache.org/
https://github.com/apache/jena
http://jena.apache.org/documentation/index.html
HP Labs
US
Open Source
Java
Apache v2
https://en.wikipedia.org/wiki/Apache_Jena