Open Access Scholarly Archive
Core (Single gateway to search open access research outputs from repositories and journals worldwide)
arXiv (Oldest and largest preprint archive of Physic , Math, Stat, Comp. Sc. and Quantitative Biology )
INSPIRE (High Energy Physics)
SAO/ NASA (Astrophysics Data)
bioRxiv ( Preprint archive of Biology, Started in 2013 by Cold Spring Harbour Laboratory)
Faculty of 1000 biology(Biological Science)
Science Central (Centralized Institutional repository harvester of DBT & DST)
Chemical Science Repository (Royal Society of Chemistry)
PeerJ PrePrints ( Preprint archive of Biology)
European ( Humanities and Social Sciences across Europe)
PubMed Central (3.1 Million full text peer reviewed articles related to biomedical and Life Sciences from National Institute of Health , USA)
Wolfram Mathworld (Mathematical Science)
OpenDOAR (Directory of Open Access repository)
ROAR (Registry of Open access Repository)
Social Science Research Network
RePEc (Economics and Development)
HINARI ( Access to Research in Health Programme)
OARE ( Research in Environmental Science)
West Bengal Public Library Network