Here’s a long list of sites where you can access free e-books. Some of these sites are a rabbit-hole for sure, but just thought I’d share. Some very interesting stuff out there in the public domain.

E-books/Books Online

Internet Archive

http://www.archive.org/

Open Library

http://openlibrary.org/

Planet E book

Planet eBook

E-books Directory

http://www.e-booksdirectory.com/

Project Gutenberg

http://www.gutenberg.org/

Internet Sacred Texts

http://www.sacred-texts.com/

Online Books Directory

http://onlinebooks.library.upenn.edu/

International Children’s Digital Library

http://en.childrenslibrary.org/

Free ebooks online Listing by Genre

http://www.techsupportalert.com/content/50-places-free-books-online.htm#genre_pages

Google Books

http://books.google.com/books