Blurb - Create and self-publish books, magazines & ebooks
calibre - Ebook manager, viewer & converter
CreateSpace - Publish your words, your way
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.