Sites that scan copyrighted books and make them available with no payment to the author are inconsiderate to the author, and they’re illegal. You would not want that to happen to your books.
References :

Free e-books.

http://2020ok.com/

http://www.loudlit.org/ *****

http://books.google.com/

http://www.truly-free.org/

http://www.readprint.com/ *****

http://www.ebooklobby.com/

The Classic Immortals – Classic Authors

http://webliterature.net/literature/index.html* * * * *

http://www.gutenberg.org/wiki/Main_Page

http://www.balajisebookworld.com/page_1.html

Novels, mystery, romance, saga, self-help, history, and more.

They are legal, in most cases from the author’s own website.
web research — scroll down for the books — web inspiration
Please honor the guidelines on these generous sites–links added every month.

http://newfreebooks.com/
References :