To design for the Friar Framework you just have to build HTML5 pages and you can unleash the power of WebKit.
You can even view it in your standard desktop browser.
Friar uses the open and simple HPub 1.0 format defined by the Baker Framework: one folder, "book/", contains all your HTML pages and all your assets.
Inside, one short file, book.json specifies page order, title, url identifier and properties of your publication.
Design your own navigation using an additional HTML file: index.html.
Download the Friar Framework and follow the simple instructions contained in the README file:
We think that digital books should be well designed, easy to publish and written in an open standard: that's why we decided to build Friar and release it under the BSD license.
The BSD License allow you to use Friar Framework for both personal and commercial use.