e-PG Pathshala : https://epgp.inflibnet.ac.in/

e-PG Pathshala is a free, open-access e-learning platform providing curriculum-based digital content for postgraduate courses across India. Launched by the Ministry of Education and executed by the University Grants Commission (UGC) with support from the INFLIBNET Centre, it covers over 70 subjects in arts, humanities, social sciences, and natural sciences.Uploaded Courses / Subjects (22000+ Modules[e-text/Video]) 

ONOS : https://www.onos.gov.in/

The Department of Higher Education, Government of India will have a unified portal “One Nation One Subscription“ through which the institutions will be able to access the journals. In response to the vision of making India Atmanirbhar and Viksitbharat@2047, the Government of India approved One Nation One Subscription scheme to provide country-wide access to international high impact scholarly research articles and journal publications to students, faculty and researchers of all Higher Education Institutions managed by the central government and state governments and Research & Development Institutions of the central government. The ANRF will periodically review the usage of One Nation One Subscription and publications of Indian authors of these institutions.

6500 Institutions, 1140 Lakhs Full-text downloads, 13,000+ A-Z journals, 27 subject categories 

DOAJ : Directory of Open Access Journals - https://doaj.org/

DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community. It is committed to ensuring quality content is openly available online for everyone. 

92 LANGUAGES, 141 COUNTRIES REPRESENTED, 14,412 JOURNALS WITHOUT FEES, 23,260 JOURNALS, 13,345,196 ARTICLE RECORDS

DOAB : Directory of Open Access Books -  https://doabooks.org/en