RP3

SciHub: - You will find full research papers here #1
sci-hub.is
sci-hub.tw
sci-hub.se
sci-hub.se

How to use Sci-hub to get academic papers for free
https://emilkirkegaard.dk/en/?p=7165

find full research papers #2:
https://cyberleninka.org

find full research papers #3
https://paperdownloader.cf

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

How to download ebooks from Library Genesis (libgen) for free
http://emilkirkegaard.dk/en/?p=7172

Free ebooks - Project Gutenberg
https://www.gutenberg.org

For finding research papers:
https://scholar.google.lt

http://datasearch.gesis.org/start

Great translator:
https://www.deepl.com/translator

Simple image hosting #1
http://magaimg.net

Simple image hosting #2
https://pasteboard.co

Archiving tools:

Archive.is (or .li .fo, w/e)

https://megalodon.jp

Perma.cc

https://web.archive.org

https://archive.st