Research Outputs are make openly available on following Institutional and Subject Repositories
AgEcon (Agriculture and Applied Economics) maintained by University of Minnesota's Department of Applied Economics
ArXiv ( pre-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics) Currently maintained by Cornell University Library
CiteSeer - (Computer and Information Science) maintained by College of Information Science and Technology at Pennsylvania State University
PhilPapers- (Philosophy) maintained by the Center for Digital Philosophy at University of Western Ontario
PubMedCentral- is a repository for US federally funded research outputs in Medicine. It is required for all publications supported by NIH ( and some other US federal agencies) funding to be deposited in PubMedCentral.
Research Papers in Economics (RePEc) is a collaborative effort of volunteers in 102 countries to enhance the dissemination of research in economics and related sciences. It is bibliographic database of working papers, journal articles, books, chapters and software components.
Social Science Research Network( SSRN)- aims at early dissemination of social science, business, law and economics research. It allows for deposit of both abstract of working papers and upcoming publications as well as full text of published outputs