- Federal Depository Library eBooks
From the website: "To help meet the needs of the Federal Depository Library (FDL) community, the U.S. Government Publishing Office (GPO) has made eBooks available in the Catalog of U.S. Government Publications (CGP).
These titles are joining the growing number of online resources that have been a vital part of the Federal Depository Library Program (FDLP) for over 20 years. Users can download GPO-provided files of eBooks free of charge, for use on various eBook reading devices."
- Internet Archive
From the website: "Internet Archive is a non-profit library of millions of free books, movies, software, music, and more." Includes "... over 6,000,000 fully accessible public domain eBooks. This includes a special modern collection of over 500,000 eBooks for users with print disabilities."
From the website: "There are more than 29,000 eBooks available for Kindle, Nook, iPad and most other eReaders, and they're all free."
- Open Library
From the website: "The World's classic literature at your fingertips. Over 1,000,000 free ebook titles available."
"Open Library is an open, editable library catalog, building towards a web page for every book ever published."
- Project Gutenberg
From the website: "Project Gutenberg offers over 46,000 free ebooks: choose among free epub books, free kindle books, download them or read them online.
We carry high quality ebooks: All our ebooks were previously published by bona fide publishers."
- SpringerOpen eBooks
From the website: "The growing demand for open access publishing across all disciplines has led Springer to expand our open access program to fully open access books.
As a further addition to our already established SpringerOpen journal portfolio we now offer authors in a wide range of areas within science, technology and medicine (STM) the option to publish open access books."