From the site:
"The open source platform to write and publish print and digital books.
"Booktype is a free, open source platform that produces beautiful, engaging books formatted for print, Amazon, iBooks and almost any ereader within minutes.
"Create books on your own or with others via an easy-to-use web interface. Build a community around your content with social tools and use the reach of mobile, tablet and ebook technology to engage new audiences. "