OAIster
OAIster was a project of the Digital Library Production Service of the University of Michigan University Library. Its goal is to create a collection of freely available, previously difficult-to-access, academically oriented digital resources that are easily searchable by anyone. OAIster harvests from Open Archives Initiative (OAI)-compliant digital libraries, institutional repositories, and online journals using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) protocol.
Read more about Oaister.