https://vellum.pub/

Do I use it: Absolutely to format 3 novels & 1 technical book

Price: $249 Lifetime - eBooks & Paperbacks

This is great software for self-publishing. It produces great looking books. It doesn’t work as easily for illustrated, technical books with charts and graphs. But for novels and reasonable simple illustrated books, it works great. Once the formatting is complete, Vellum creates all the necessary publishing versions that can be verified on Kindle, Nook, Kobo, and Apple. And it produces the print/pdf version.