Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Eduonix - An e-Library to Learn, Grow and Succeed.
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Crehana - Crehana is an on-demand learning platform.
LibriVox - free public domain audiobooks
Edoome - Edoome offers an online community enabling teachers and students to communicate and collaborate.