SquirrelRDF

SquirrelRDF is a tool which allows non-RDF data stores (or, perhaps, not explicitly RDF) to be queried using SPARQL. In its current form this includes relational databases (via JDBC) and LDAP servers (via JNDI). It provides an ARQ QueryEngine (for java access), a command line tool, and a servlet for SPARQL http access. As a result the information now looks like RDF, and is always current. It is part of the Jena suite of java RDF tools.