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www.worldcat.org-a search for the contents of 20 thousand worldwide libraries. Find out where lies the nearest rare book you need.
https://link.springer.com - access to more than 10 million scientific documents: books, articles, research protocols.
www.bioline.org.br is a library of scientific bioscience journals published in developing countries.
http://repec.org - volunteers from 102 countries have collected almost 4 million publications on economics and related science.
www.science.gov is an American state search engine on 2200+ scientific sites. More than 200 million articles are indexed.
www.pdfdrive.com is the largest website for free download of books in PDF format. Claiming over 225 million names.
www.base-search.net is one of the most powerful researches on academic studies texts. > 100 million scientific documents, 70% are free