Jena
The current version is Jena 2.0
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
Joseki
Joseki is a RDF publishing server, providing access to RDF modles by URL and query.
Jena1
The previous Jena1 download is still available but is no longer under development. Users are encouraged to use Jena2.