JBossCache is a clustering solution as described above. It also provides JMX capabilities for administration.
I suggest you the visual clustering demo application for start: http://jbosscache.blogspot.com/2008/01/gui-demo-for-jboss-cache.html
re:Jofti, guess it it rather intended as a layer that adds searching abilities on top of various cache solution, rather than a generic cache abstraction. If your application needs the kind of cahe search Jofti offers I think you should consider it.