arXiv
E-Print ArXiv is pre-print archive, it covers over 900,000 plus e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics. ArXiv is managed by Cornell University Library. http://arxiv.org/
Chemical Sciences Repository
Chemical Sciences Repository is a non-commercial subject specific Open Access repository for chemistry papers, hosting Green and Gold Open Access (OA) papers and linking back to the Publisher’s Article of Record. It is managed by Royal Society of Chemistry. http://www.rsc.li/repository
Cogprints
CogPrints is an archive for self-archive papers in any area of Psychology, Neuroscience, and Linguistics, and many areas of Computer Science, Philosophy, Biology, Medicine, Anthropology as well as any other portions of the physical, social and mathematical sciences that are pertinent to the study of cognition. It is managed by the School of Electronics and Computer Sciences, University of Southampton. http://cogprints.org/
Cryptology ePrint Archive
The Cryptology ePrint Archive is an electronic archive of new results in the field of cryptography, maintained by the International Association for Cryptologic Research. It contains articles covering many of the most recent advances in cryptography. http://eprint.iacr.org/
E-Print Network
E-Print Network is e-print initiated by Science Accelerator. It includes preprints, reprints, technical reports, conference publications or other means of electronic communication. www.osti.gov/eprints/
Educational Resources Information Center
The Education Resources Information Center (ERIC) is an electronic archive of education research and information. ERIC is sponsored by the Institute of Education Sciences of the United States Department of Education. http://eric.ed.gov/
hprint
hprints is an archive for electronic preprints of papers in the fields of Arts, Humanities and Social Sciences. It is a collaboration between Centre National de la Recherche Scientifique (CNRS) and a consortium of Nordic university libraries. http://www.hprints.org/
Mathematical Physics Preprint Archive
An electronic archive for research papers in Mathematical Physics and related areas. It is hosted by Mathematics Department, University of Texas at Austin. http://rene.ma.utexas.edu/mp_arc/
Organic eprints
Organic Eprints is an international open access archive for papers and projects related to research in organic food and farming. It jointly supported by International Centre for Research in Organic Food Systems, Geschäftsstelle Bundesprogramm Ökologischer Landbau in der Bundesanstalt für Landwirtschaft und Ernährung and Research Institute of Organic Agriculture. http://orgprints.org/
PhilSci-Archive
PhilSci-Archive is an electronic archive for preprints in the subject area of “philosophy of science”. The said archive is managed by University of Pittsburgh. http://philsci-archive.pitt.edu/
RePEc (Research Papers in Economics)
RePEc (Research Papers in Economics) is a collaborative effort of volunteers in Economics and related sciences. It covers over 1,600 archives from 80 countries have contributed about 1.4 million research pieces from 1,800 journals and 3,800 working paper series. http://repec.org/
Social Science Research Network (SSRN)
The Social Science Research Network (SSRN) is an open access repository of scholarly research in the social sciences and humanities. SSRN is composed of a number of specialized research networks including Economics, Financial Economics and Legal Scholarship. The SSRN contains abstracts for scholarly articles, working papers and forthcoming papers, as well as over 390,000 downloadable full-text documents. http://www.ssrn.com/
Solar Physics E-Print Archive
The Solar Physics E-Print Archive is an on-line, searchable archive of links to on-line preprints and unpublished work of broad interest to researchers in solar and heliospheric physics. It is managed by Solar Physics Group at Montana State University. http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl
viXra
ViXra.org is an alternative e-print archive to the arXiv.org. It contains over 6000 plus e-prints in Science and Mathematics. http://vixra.org/