
Project Gutenberg
is a library of over 60,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online. You will find the world's great literature here, with focus on older works for which U.S. copyright has expired.

Standard Ebooks
is volunteer-driven, non-profit project is dedicated to producing high-quality standard ebooks from public domain works, with a focus on careful formatting, open-source accessibility, and ensuring they remain freely available to everyone.

Internet Archive: National Emergency Library
provides a collection of books that supports emergency remote teaching, research activities, independent scholarship, and intellectual stimulation while universities, schools, training centers, and libraries are closed.

Internet Archive: Open Library
is an open, editable library catalog, building towards a web page for every book ever published.