| 1 | Google Books | https://books.google.co.in/bkshp?hl=en&tab=pp&authuser=0 | Multidisciplinary |
| 3 | University of Pennsylvania | http://digital.library.upenn.edu/books | General |
| 4 | FreeTechBooks | https://www.freetechbooks.com/ | SOE SOM |
| 5 | CAMPUSBOOKS | https://www.campusbooks.com/ | TextBook |
| 6 | University of Virginal Library | https://search.lib.virginia.edu/ | General |
| 7 | The National Academies Press | http://www.nap.edu/index.html | SOE |
| 8 | Hindustan Books | https://www.hindustanbooks.com/ | India History books |
| 9 | Digital libray of India | https://ndl.iitkgp.ac.in/ | done membership |
| 10 | Dirctory of Opec Access Books DOAB | https://www.doabooks.org | Multidisciplinary |
| 11 | Classic Book Shelf | http://www.classicbookshelf.com/ | General |
| 13 | The Universal Digital Library | http://ulib.isri.cmu.edu/ | SOE SOL SOM |
| 14 | Zlibrary | https://b-ok.cc/ | Multidisciplinary |
| 15 | American Institutes of Mathematics | https://aimath.org/textbooks/approved-textbooks/ | Mathematics Books |
| 16 | Open Textbooks Library | https://open.umn.edu/opentextbooks/ | Multidisciplinary |
| 17 | Open Texts | https://opentexts.world/ | General |
| 18 | Textbook Revolution | http://textbookrevolution.org/index.php/Main_Page | Multidisciplinary |
| 19 | Bookboon | https://bookboon.com/ | Multidisciplinary |
| 20 | Eropeana | https://www.europeana.eu/portal/en | Cultural materials |
| 21 | Textbook Nova | https://textbooknova.com/ | Multidisciplinary |
| 22 | Open Library | https://openlibrary.org/ | General |
| 23 | Free Book Spot | http://www.freebookspot.es/ | Multidisciplinary |
| 24 | E-Book 3000.com | http://www.ebook3000.com/ | Multidisciplinary |
| 25 | Internet Archive | https://archive.org/ | General audio/vedo sources |
| 26 | Project Gutenberg | http://www.gutenberg.org/ | General |
| 27 | Chest of Books | https://chestofbooks.com/ | Multidisciplinary |
| 28 | Library Thing | https://www.librarything.com/ | General |
| 29 | LibriVox | https://librivox.org/ | Audio Books |
| 30 | Bean | https://www.baen.com/ | General |
| 31 | TradePub | https://knowfree.tradepub.com/ | Multidisciplinary |
| 32 | Online Programming Books | https://www.onlineprogrammingbooks.com/ | Computer books |
| 33 | Book Yards | https://www.bookyards.com/en/welcome | Multidisciplinary |
| 34 | Public Domain | http://www.feedbooks.com/publicdomain | General |
| 35 | Lean Pub | https://leanpub.com/ | Multidisciplinary |
| 36 | Open Culture | http://www.openculture.com/ | Movies, Audio & General books |
| 37 | Get Free E-books | https://www.getfreeebooks.com/ | 64 javascript ebooks & Tutorial |
| 38 | SCRIBD | https://www.scribd.com/ | Audio & general books |
| 39 | PDFDRIVE | https://www.pdfdrive.com/ | Multidisciplinary |
| 40 | Mobile9 | https://gallery.mobile9.com/ | general |
| 41 | All IT Ebooks | http://www.allitebooks.com/ | IT Books |
| 42 | Easy Engineering | https://easyengineering.net/ | Engineering books |
| 43 | Many Books | https://manybooks.net/ | General |
| 44 | Free-Ebooks.Net | https://www.free-ebooks.net/ | General |
| 45 | bookFi | http://bookfi.net/ | Multidisciplinary |
| 46 | ई साहित्य प्रतिष्ठान | http://www.esahity.com/ | marathi novels |