- Project Gutenberg: Massive library of public domain books. Everything is open source
- Standard Ebooks: Community driven library of public domain books. The catalog is relatively small, but every book has pretty and modern formatting, metadata, cover, etc. Everything is free and open source.
- Library Genesis: File sharing website, mostly for math, science, and computer stuff. It enables free access to a lot of otherwise paywalled content.
- the /lit/ Wiki: A wiki for /lit/, 4chan's literature board. Has a lot of recomendations and charts.