1. Planet eBook
2. Free-eBooks.net – https://www.free-ebooks.net/
3. ManyBooks – https://manybooks.net/
4. LibriVox – https://librivox.org/
5. Internet Archive – https://archive.org/
6. BookBub
7. Open Library – https://openlibrary.org/
8. BookBoon – https://bookboon.com/
9. Feedbooks
10. Smashwords
11. Project Gutenberg – https://www.gutenberg.org/
12. Google Books – https://books.google.com
13. PDFBooksWorld – https://www.pdfbooksworld.com/
14. FreeTechBooks
15. Bookyards
16. GetFreeBooks
17. eBookLobby – https://www.ebooklobby.com/
18. FreeComputerBooks
19. OpenCulture – https://www.openculture.com/
20. LibGen – http://libgen.is/
21. Obooko – https://www.obooko.com/
22. O’Reilly – https://www.oreilly.com/
23. Pdfdrive – https://www dot pdfdrive dot com/
24. Anna’s Archive – https://annas-archive.org/
25. Pdfroom – https://pdfroom.com/
26. Pdf coffee – https://pdfcoffee.com/
27. Dokumen Pub – https://dokumen dot pub/
28. Z Library – https://zlibrary.to/
39. Ocean of PDF – https://oceanofpdf dot com/
30. Dirzon – https://dirzon.com/
31. Booksfree – https://www.booksfree.org/
32. EngbooksPDF – https://www.engbookpdf.com/