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Pre-prints are pre-published journal articles that can be made available if the publisher permits it. They are placed on a pre-print server and may be read online. Pre-print articles may not been subject to peer review.

ORCA (Online Research@Cardiff) is a digital repository of research publications and pre-prints from Cardiff University authors. The full text of publications is made freely available if copyright permission is obtained. 

CogPrints Contains refereed reprints of research articles and pre-prints in psychology, neuroscience, linguistics and computer science.

Directory of Mathematics PrePrint and ePrint Servers A directory of pre-print archives in mathematics. It lists websites and email contacts of mathematical preprint and ePrint servers throughout the world.

ePrint network From the U.S. Department of Energy, this pre-print network covers physics, materials, chemistry, mathematics, biology and environmental sciences. It allows you simultaneously to search a number of selected sites. It also offers a ePrint Alert facility that will automatically notify you when new information is available in your subject area.

IDEAS The 'Internet Documents in Economics Access Service' provides information about working papers and published research to the economics profession. The archive principally covers physics, mathematics, computer science, and quantitative biology.

Pub-Med Central is the U.S. National Institutes of Health (NIH) free digital archive of biomedical and life sciences journal literature.