iBooks Author - iBooks Author, free from the Mac App store, allows you to create beautiful Multi-Touch textbooks — and just about any other kind of book.
Lulu - Whether you're a teacher, photographer or hobbyist, share your expertise. Create & self publish your book today!
Atavist - Atavist provides a suite of publishing tools to tell stories and build websites.
CreateSpace - Publish your words, your way
Mobipocket eBook Creator - Mobipocket eBook Creator is one of the easiest way to create a professional level of eBooks by simply providing some HTML and image files to your publication.
Issuu - Issuu is the leading digital publishing platform delivering exceptional reading experiences of magazines, catalogs, and newspapers.