Lis Learning

1. Alex Catalogue of electronics Texts 

2. American Verse Project 

3. AMS (American Mathematical Society) Books 

4. Authorama Public Domain Books

5. Bibliomania

6. Bookboon

7. Bookyards

8. CABI 

9. DE GRUYTER 

10. Digital Library of India (DLI)

11. Directory of Open Access Books (DOAB)

12. E-Book Lobby

13. E-Books Directory  

14. Free Book Spot

15. Free eBooks for Life

16. Free Engineering Books

17. Freebookcentre.net

18. FreeComputerBooks.com

19. Get Free eBooks 

20. Google Books

21. HathiTrust Digital Library

22. Intech 

23. Internet Archive

24. JSTOR 

25. Knowledge Unlatched 

26. Librarian Resources

27. LibriVox -Audio Books

28. M Library

29. ManyBooks

30. McGill Library (Open & Free Resources) 

31. MIT Online Textbooks 

32. National Digital Library of India (NDL)

33. Northcentral University Library

34. Notre Dame De Namur University 

35. O’REILLY 

36. OAPEN 

37. Open Acess E-BOOKS 

38. Open Access Library 

39. Open Access to ACM Digital Library

40. Open Knowledge Repository - World Bank 

41. Open Library

42. Open Textbook Library

43. Palgrave Macmillan

44. PDF Drive

45. Project Gutenberg  

46. Public Books Database

47. Public Library of Science-PLOS

48. Rare Book Room

49. ReadPrint

50. Springer Open Books

51. World eBook Library 

52. World Library Foundation Branches and Portals 

53. ZSR Library