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Jena semantic web toolkit
java API for manipulating RDF models, uses Berkeley DB (Sleepycat) for storage and also offers support for relational databases
RDFStore
PERL API for RDF storage
Redfoot
Framework for building distributed data-driven web applications with RDF and Python.
Redland RDF Application Framework
library which provides a high-level interface for storing, querying and manipulating the RDF data model