WEB PAGE ARCHIVAL AND OBSCURITIES
- Web Design Museum
- Library of Babel
- Superbad
- Ikigusare
Alternative Invidious instance, if you prefer
OPEN ACCESS
- Anna's Archive
- Project Gutenberg
- The Online Books Page
- Sci-Hub
- Library Genesis
- Archive.org/Wayback machine
- The Biodiversity Heritage Library
- Franz Kafka Online
- H.P. Lovecraft Archive
- Public Domain Review
- Wikimedia Commons
- Heritage Library
- Smithsonian Open Access
- MoMa Open Access
- National Gallery of Art Open Access
- Art Institute of Chicago Open Access
- Cleveland Museum of Art Open Access
EXPLANATION: You can actually find a lot of PDFs if you know what you're looking for. When you type your author or title in the search bar, be sure to categorize it as said PDF
They also have a collection of scans over at Flickr.