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Jena

The current version is Jena 2.4

The Jena download area on sourceforge.net contains previous versions.

ARQ is packaged with Jena. Updated versions are available via the ARQ download page.

Jena CVS

Browse the Jena CVS area: Jena CVS on SourceForge

Details on setting up CVS: Jena CVS Repository

Joseki is a RDF publishing server, providing access to RDF models by URL and query.

Eyeball is an "RDF lint" for checking RDF/OWL models for common issues such as illegal URIs, missing property values, and incorrect prefix mappings.