Harvard University(free registration):
National Digital Library Project of India (free registration : developed by IIT, Kharagpur):
https://www.ndl.gov.in/ or https://ndl.iitkgp.ac.in/ to access academic resources free of cost.
Open Yale Courses:
South Asian Archive:
http://www.southasiaarchive.com/
Jstor:
Project Muse:
https://about.muse.jhu.edu/muse/open-access-overview/
ProQuest: rich repository of humanities and social sciences:
https://pqdtopen.proquest.com/search.html
WBDSPACE: Huge resource of rare books on Sanskrit, Bengali, English, Santali, History, Politics, Sociology, Psychology etc. :
http://dspace.wbpublibnet.gov.in:8080/jspui/
Social Science Research Network
https://www.ssrn.com/index.cfm/en/
CORE: Humanities and social sciences eResources:
ScienceOpen: for all areas of science including climate change and ageing:
ar.Xive.org : All areas of science resources supported by Cornell University
Paperity: multidisciplinary eResource
Dryad: huge resource for scientific research data
Ethos: 500,000 doctoral theses in all areas made available by British Library
Huge resource of doctoral theses made available by Australian National University
https://openresearch-repository.anu.edu.au/handle/1885/3
DART Europe: doctoral theses from all over Europe:
http://www.dart-europe.eu/basic-search.php
Ebsco host: doctoral theses on literature, politics, international relations, law, history, sociology etc:
SemanticScholar: science-related resource
DLC: supported by Indiana University
http://dlc.dlib.indiana.edu/dlc/
BASE: interdisciplinary resources provided by Bielefeld University, Germany
Trove: resources for digitised Australian newspapers (since 19th century), govt gazettes, books, journals, maps etc provided by National Library of Australia :