These are links to free eBooks:

Project Gutenberg-http://www.gutenberg.org
DailyLit - https://www.dailylit.com/
Directory of Open Access Books - http://doabooks.org
Internet Archive Text Archive - http://archive.org/details/texts
Classic Reader - http://www.classicreader.com/
Google Books (not all free) - http://books.google.com/