TumbleBookLibrary is an online collection of animated, talking picture books which teach young children the joys of reading in a format they'll love (grades K-2), as well as eBooks and read-along chapter books, non-fiction books, graphic novels, educational videos, and audio books designed specifically for kids in 3rd - 6th grade.
TumbleBookCloud is an online collection of eBooks, Graphic Novels, Enhanced Novels, eBooks, classic literature, National Geographic videos, and audiobooks perfect for 6th - 12th graders.
Obooko Hundreds of eBooks available in a wide range of genres and categories
Open Culture This collection features free e-books, mostly classics, that you can read on your iPad / iPhone, Kindle, Nook or other devices. It includes great works of fiction, non-fiction and poetry.
Open Library Access over 1 million eBooks through Open Library.
Project Gutenberg Project Gutenberg offers over 36,000 free eBooks to download to your PC, Kindle, Android, iOS or other portable device. Choose between ePub, Kindle, HTML and simple text formats. These ebooks are free in the United States because their copyright has expired.