Libraries

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http://www.gumer.info/
http://royallib.com/
http://hyperlib.libfl.ru/
http://yanko.lib.ru/
http://bookboon.com/

Материалы для уроков
http://www.onestopenglish.com/

Some interesting books

https://www.pdfdrive.com/category/6

https://www.pdfdrive.com/learning-to-think-like-a-lawyer-e33614527.html

https://www.pdfdrive.com/the-art-and-craft-of-problem-solving-e13909465.html

https://www.pdfdrive.com/google-web-toolkit-gwt-java-ajax-programming-a-practical-guide-to-google-web-toolkit-for-creating-ajax-applications-with-java-e158459582.html

https://www.pdfdrive.com/how-to-use-power-phrases-to-say-what-you-mean-mean-what-you-say-get-what-you-want-e157025751.html