calibre - Ebook manager, viewer & converter
Lulu - Whether you're a teacher, photographer or hobbyist, share your expertise. Create & self publish your book today!
FBReader - FBReader is an e-book reader for various platforms. Features:
IngramSpark - IngramSpark is an Online publishing services provider platform that allows you to publish or print books that are in high quality, and its global distribution service enables you to post and share around the globe.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Blurb - Create and self-publish books, magazines & ebooks