Integrated Rule-Oriented Data System (iRODS)
http://www.irods.org
LOCKSS (Lots of Copies Keep Stuff Safe) - open source, peer-to-peer software that functions as a persistent access preservation system
http://www.lockss.org/
Storage Resource Broker (SRB) - San Diego Supercomputer Center (SDSC) - "supports shared collections that can be distributed across multiple organizations and heterogeneous storage systems"
http://www.sdsc.edu/srb/