@tripu IMO: most good books in math and CS are either freely available or priced reasonably enough and have non-abusive publishers so you shouldn't pirate them.
But I loved that site as a student. I could get almost any book on any subject I wanted and didn't have to go to the library for it.
@swiley It's not for technical #books that I'm interested in resources like #LibGen, but for old #literature: sometimes it's surprisingly difficult to find editions of the #classics!
@swiley #StandardEbooks is doing a great job, but they go manually through editions, therefore have a very limited collection (compared to https://www.gutenberg.org/ , https://www.wikibooks.org/ , https://openlibrary.org/ , https://archive.org/details/books , etc). #books