Below are great directories of Open Access scholarship and other resources. There are a lot here, and new ones are always being added!
Social Science Research Network. Devoted to the rapid worldwide dissemination of social science research and is composed of a number of specialized research networks in each of the social sciences.
OAIster by WorldCat. Union catalog of digital resources; contains digital resources from open archive collections. Represents multidisciplinary resources from more than 1,100 contributors worldwide. Records contain a digital object link allowing users access to the object in a single click.
OpenAIRE. Based in Europe, provides access to 11,534,086 publications and 7,874 datasets from 5,869 repositories and OA journals.
OpenDOAR. The Directory of Open Access Repositories service provides a quality-assured listing of open access repositories around the world.
PLOS Public Library of Science. PLOS (Public Library of Science) is a nonprofit publisher and advocacy organization founded to accelerate progress in science and medicine by leading a transformation in research communication.
PubMed Central. A free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM).
ROAR – Registry of Open Access Repositories. The aim of ROAR is to promote the development of open access by providing timely information about the growth and status of repositories throughout the world. Open access to research maximizes research access and thereby also research impact, making research more productive and effective.
American Memory. American Memory provides free and open access through the Internet to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience. [Library of Congress]
Chronicling America. Search America's historic newspaper pages from 1836-1922 or use the U.S. Newspaper Directory to find information about American newspapers published between 1690-present.
arXiv. Open access to 989,444 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.
Data.gov. Provides easy to find, download, and use datasets that are generated and held by the Federal Government.
Digital Public Library of America - DPLA. Offers a single point of access to millions of items—photographs, manuscripts, books, sounds, moving images, and more—from libraries, archives, and museums around the United States.
Encyclopedia of Earth. An electronic reference about the Earth, its natural environments, and their interaction with society.
Federal Digital System. GPO’s Federal Digital System (FDsys) provides free online access to official publications from all three branches of the Federal Government.