Mulgara is a RDF DBMS written entirely in Java
Triplestore / RDF
SPARQL
http://www.mulgara.org/
https://github.com/quoll/mulgara
http://mulgara.org/documentation.html
US
2006
Open Source
Java
Open Software License 3.0
https://en.wikipedia.org/wiki/Mulgara_(software)