Any many, many, many more!
Sesame
RDFSuite
RDFStore
4Suite
Euler
Kowari - Open Source, massively scalable, transaction-safe, purpose-built database for the storage and retrieval of RDF metadata.
...
Sesame
RDFSuite
RDFStore
4Suite
Euler
Kowari - Open Source, massively scalable, transaction-safe, purpose-built database for the storage and retrieval of RDF metadata.
...