Largest Electronic Books, Articles, Magazines, Software Store

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Sources of knowledge:

Pre-prints

https://arxiv.org/

Books and pages

http://cnx.org/contents

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https://b-ok.org/

http://bookboon.com/

https://www.pdfdrive.com/

http://www.allitebooks.org/

https://en.booksee.org/

http://en.bookfi.net/

http://www.gutenberg.org/

https://booksc.org/

http://gen.lib.rus.ec/

https://b-ok.xyz/

https://fr.booksc.org/

Includes movies, software and music:

https://archive.org/

https://libgen.is/

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Go to electronic articles store

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SciHub:

https://sci-hub.tw/