PressBooks rocks digital book publishing

If you’re looking for a digital book publishing platform and are comfortable with setting up a WordPress multi-site installation, then consider hosting your own PressBooks site. (And if you’re not sure, then try a free account to create a limited number of books at http://pressbooks.com).

Also check out the growing user’s guide at
http://guide.pressbooks.com

See also the PressBooks Textbook plugin/theme, which works best for my open-access academic writing
https://wordpress.org/plugins/pressbooks-textbook/