calibre - Ebook manager, viewer & converter
Eduonix - An e-Library to Learn, Grow and Succeed.
FBReader - FBReader is an e-book reader for various platforms. Features:
Crehana - Crehana is an on-demand learning platform.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Edoome - Edoome offers an online community enabling teachers and students to communicate and collaborate.