CDSware (Popularity: )
http://cdsware.cern.ch/ An OAI-compliant software for document servers developed at CERN and licensed under GNU General Public License (GPL). Allows institutions to build their own electronic library and to make it accessible ...
Open Archives Initiative (Popularity: )
http://www.openarchives.org/ The Open Archive community. Promotion of interoperability standards that aim to facilitate the dissemination of content, by enhancing access to e-print archives. Online documents, links and forums.
DSpace (Popularity: )
http://www.dspace.org/ An Open Archive Initiative (OAI) - compliant open-source software released by MIT for archiving eprints and other kinds of academic content. Mission, policy, technical features, implementations.