Jena
The Jena download area on sourceforge.net contains previous versions.
Jena CVS
Browse the Jena CVS area: Jena CVS on SourceForge
Details on setting up CVS: Jena CVS Repository
Maven
The Jena Maven repository is located at http://jena.hpl.hp.com/repo.
ARQ
ARQ is packaged with Jena. Updated versions are available via the ARQ download page.
SDB
SDB is distributed from the Jena download area on SourceForge.
Joseki
Joseki is a RDF publishing server, providing access to RDF models by URL and query.
Eyeball
Eyeball is an "RDF lint" for checking RDF/OWL models for common issues such as illegal URIs, missing property values, and incorrect prefix mappings.