+1 for Anna’s Archive. It’s an amazing resource for students too, since they keep research papers and textbooks.

And before someone gets up in arms about the research papers, the researchers don’t get paid by the journals for publishing with them. In fact, the researchers need to pay the journal to publish, and then the journal turns around and charges people to read it.

If you ever need to get research for free, you can usually email the researchers directly and they’ll be happy to share it for free; They hate the journals too, (because like I said earlier, they have to pay the journal thousands of dollars,) but feel obligated to use them to publish.

Even worse, that research and journal publishing was often funded by public funds and research grants. So the journal is paywalling research that taxpayers already paid for, and should be free to access.