Scribus - Scribus is a desktop publishing (DTP) application.
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.
Adobe InDesign - Adobe InDesign is a desktop publishing software application.
kotobee - Kotobee is a universal eBook creating and publishing software for the authors, novelist, writers, etc.
Affinity Publisher - Professional desktop publishing app
SQRIBBLE - Creates AMAZING eBooks & Reports In 5 MINUTES Without Typing Any Words!