The internet archive is becoming an alternative good internet. It has a web archive, film archive, software archive, media archive... and now research papers archive. That is the internet as a giant library as we dreamed in early 90's.
Way too centralized (Centranet?), but it is very nice for now. It's a bit like the library of Alexandria, so it could change/disappear at any time.
[0] https://ipfs.io/