Anna’s Archive : https://annas-archive.org/

" 📚 The largest truly open library in human history. ⭐️ We mirror Sci-Hub and LibGen. We scrape and open-source Z-Lib, DuXiu, and more. 📈 42,295,586 books, 98,401,812 papers — preserved forever. All our code and data are completely open source. "