Freebooksy is a source for finding free e-books.

Open Culture provides free online courses, audiobooks, movies, podcasts, and ebooks.

LibriVox has public domain audiobooks that have been read by volunteers.

The Literature Network provides online literature, books by famous authors, author biographies, and literature quotes.

Feedbooks lets you discover thousands of eBooks, including new releases and the best collection of free public domain books, that you can read on any mobile device.

Open Library provides a large scale catalog of books.

Biblioboard offers access to free ebooks throughout Illinois. Indie and self published authors in Illinois and across the country. Books are reviewed by Biblioboard and Library Journal.

Manybooks provides 29,000 free ebooks.

Free-ebooks.net includes access to downloadable ebooks, from published and nonpublished authors. You will need to register for this site.