O Universia Brasil trouxe uma lista com 90 sites para você encontrar livros dos mais variados gêneros. Alguns oferecem a opção de baixar os títulos gratuitamente. Confira:

1. Classic Bookshelf

2. The Online Books Page

3. Project Gutenberg

4. Page by Page Books

5. Classic Book Library

6. Classic Reader

7. Read Print

8. Planet eBook

9. Bibliomania

10. Online Library of Literature

11. Bartleby

12. Fiction.u

13. Free Classic Literature

14. Textbook Revolution

15. Wikibooks

16. KnowThis Free Online Textbooks

17. Online Medical Textbooks

18. Online Science and Math Textbooks

19. MIT Open Courseware Supplemental Resources

20. Free Business Textbooks

21. Light and Matter

22. eMedicine

23. FullBooks.com

24. Online Mathematics Texts

25. Science and Engineering Books for free download

26. FreeScience.info

27. Free Tech Books

28. byGosh

29. Munseys

30. International Children’s Digital Library

31. Bored.com

32. Ideology.us

33. Free Books on Yoga, Religion and Philosophy

34. Religion eBooks

35. ReadBookOnline.net

36. Plays

37. The Complete Works of William Shakespeare

38. Plays Online

39. ProPlay

40. Public Bookshelf

41. The Internet Book Database of Fiction

42. Free Online Novels

43. Baen Free Library

44. Get Free Ebooks

45. John T. Cullen

Confira a lista completa aqui.