1. National Digital Library of India (NDLI) - https://ndl.iitkgp.ac.in/

2. E-Books Directory - Click here​

3. Internet Archive - https://archive.org/

4. Project Gutenberg - https://www.gutenberg.org/

5. Directory of Open Access Books - https://www.doabooks.org/

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

7. Open Library - https://openlibrary.org/

8. Rare Book Room - http://www.rarebookroom.org/

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