Download any Academic Article (Paper) and Book [Free]

Here you can find some websites that provide free access to academic content.

First, a video about this topic. If you are having second thoughts about this free access content, please watch this video. 

Sci-Hub

This website is the well known Sci-hub created by Alexandra Elbakyan. Here you can find almost any academic paper.

https://sci-hub.se/

Library Genesis

Another site where yo can find papers is Library Genesis scholarly journal articles, academic and general-interest books, images, comics, and magazines. If you need a book this is a good website  to start looking for .

https://libgen.is/

Z-Library

If you don't find the book or article you are looking for in the previous websites, Z-Library is a good option.

https://z-lib.org/

OATD  (Theses)

On this website you can find publicly available theses.. "OATD.org aims to be the best possible resource for finding open access graduate theses and dissertations published around the world. Metadata (information about the theses) comes from over 1100 colleges, universities, and research institutions. OATD currently indexes 5,775,433 theses and dissertations"

https://oatd.org/

Torrent

Finally, the last resort is Torrent. Academic material can be difficult to find here, but it is worth a try. Common websites include ThePirateBay, KickassTorrent or LimeTorrents. The domain name of these websites is constantly changing, so look them up on Google. I recommend using the software qBittorrent to download a torrent file.