INFLIBNET-NLIST
Information and Library Network (INFLIBNET) Centre is an autonomous Inter-University Centre of the University Grants Commission (UGC) of India. It was initiated by the UGC in March 1991 as a project under the IUCAA and became an independent Inter-University Centre in June 1996. It provides links to J-Stor, Shodh-ganga and many other e-resources.
National Digital Library : https://ndl.iitkgp.ac.in/
openstax : https://openstax.org/subjects
Bookboon : https://bookboon.com/en/textbooks
COM LIBRARY : https://libguides.com.edu/c.php?g=649161&p=4553982
Library Genesis : http://libgen.li/
Open Textbook Library : https://open.umn.edu/opentextbooks/
Scholar Works : https://scholarworks.gvsu.edu/books/
Quick Notes : http://www.textbooksfree.org/Free%20HS%20Textbooks.htm
BD ebooks : https://bdebooks.com/ (for Bengali books)
Bangla ebooks : https://www.banglabooks.in/ (for Bengali books)
Bengali ebooks collection : https://in.pinterest.com/anirbansarkar52/get-bangla-ebook-pdfs/ (for Bengali books)
Bengali Ebook PDF : https://www.worldmets.com/ (for Bengali books)
Bangla Library : https://www.ebanglalibrary.com/ (for Bengali books)