Awesome Library---Books on the Web [1]
International Children's Digital Library [2]
Library of Congress: Books for Kids [3]
The Story Home [4]
Links:[1] http://www.awesomelibrary.org/Library/Title_Search/Books_(Free)_on_the_Web/Books_(Free)_on_the_Web.html [2] http://www.childrenslibrary.org/ [3] http://read.gov/kids/ [4] http://thestoryhome.com/