Free, open source and community driven.
To start, there are following two paths to take to pick up Superbook publishing:
Method 1: In-browser playground
If not and if you're an absolute beginner with no knowledge of how HTML, CSS and JS work, we recommend you to start on this tutorial to get your feet wet.
Note, this method will publish only on Bubblin.
Method 2: Using Bookiza Abelone
The second option, using Bookiza, is much more technical (low level) and involved book writing strategy. Bookiza can be used to create, edit, publish, update and republish Superbooks from the comfort of your local machine (terminal).
Bookiza let's you publish anywhere, i.e. on Bubblin or on your own website.QUOTE
Bookiza is a lightweight book reification framework that cuts down your book-writing time by half… It is adapted directly from modern developer toolchain (using git, markdown, haml etc.) in such a way that it's easy to collaborate with anyone who can help turn your book into a finished product.UNQUOTE
Visit site https://bookiza.io for more details.
Documentation for bookiza can be found at https://bubblin.io/bookiza/docs.