ICPSR, the Inter-university Consortium for Political and Social Research, was established by University of Michigan in 1962, an integral part of the infrastructure of social science research.

Scirus is a search engine that scans an international collection of institutional repositories and other resources.

EPA National Publications

IDEAS is the largest bibliographic database dedicated to Economics and available freely on the Internet. Based on Research Papers in Economics (RePEc), which is a collaborative effort of hundreds of volunteers in many countries to enhance the dissemination of research in economics.

NCSTRL (pronounced "ancestral", Networked Computer Science Technical Reports Library) is an international collection of computer science technical reports made available for non-commercial use from a number of participating institutions.