Online Books

Archive.org - Search this non-profit library of millions of free books, movies, software, music, websites, and more.

CK-12 - Provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts.

Directory of Open Access Books - Discover more than 60,500 academic peer-reviewed books.

Google Books - Explore the world's most comprehensive index of full-text books.

HathiTrust Digital Library - Explore HathiTrust's collection of academic and research libraries preserving 17+ million digitized items.

OASIS - OASIS is a search tool that aims to make the discovery of open content easier, including textbooks, courses, primary sources and more.

Open Library - Discover more than 3 million books.

Open Textbook Library - Access over 1,400 open textbooks written by licensed authors and publishers.

Project Gutenberg - With a focus on classic titles that are in the public domain, you can access over 60,000 eBooks for free.