Internet Archive - Non-profit library of millions of free books, movies, software, music, websites, and more.

media.ccc.de - This site offers a wide variety of video and audio material distributed by the Chaos Computer Club.

Queer Zine Archive - First launched in November 2003 in an effort to preserve queer zines and make them available to other queers, researchers, historians, punks, and anyone else who has an interest DIY publishing and underground queer communities.

Library Genesis - A free online library of various literature and nonfiction, including many textbooks.

Sci-Hub - Free access to tens of millions of research papers, including those that are otherwise paywalled.

arXiv

Public Lab

PhilPapers

HAHA Academy