LWers who liked this may also like: http://sci-hub.bz/

About: https://en.wikipedia.org/wiki/Sci-Hub

Basically, if you search for something and they don't have it, there's a huge network of scientists with access to pay-walled journals, and one of them will add a PDF. They've grown larger than any of the journal subscription companies, and have the world's largest collection of scientific papers.