Any and all Journal articles download for free.

Sci-Hub is a paywall-bypassing website that uses "shared" user credentials to provide PDF or HTML scientific papers. The website itself doesn't store any papers.

LibGen archives each Sci-Hub query:
http://gen.lib.rus.ec or http://libgen.io
Main info. no content site:
https://scihub.org
Search/download site:
https://sci-hub.tw may change domain depend on legal actions.

I think it costs around 5k for a major journal to give open access to a paper. Needless to say we're missing out on a lot of info. because of greedy middlemen. There may even be anomalous phenomenon that were published with the intent of only being seen by the "club", and they new the public wouldn't be likely to see it.