What programs are used to create e-books?

Question

Electronic books

Interested in software that creates e-books, EPUB and FB2 formats such companies as, for example, litres.ru

Answer 1

https://code.google.com/archive/p/fictionbookeditor/
FictionBook Editor

Answer 2

Books are created / typeset in special programs, such as Adobe InDesign .
You can output them in a variety of formats, including EPUB. In InDesign, it's just the File - Export menu.

Answer 3

When will all these formats be available in WordMicrosoft)