Take a look at Softcover (http://www.softcover.io/ http://www.softcover.io/), which is a 100% open-source ebook production toolchain used to produce the Ruby on

Take a look at Softcover (http://www.softcover.io/ http://www.softcover.io/), which is a 100% open-source ebook production toolchain used to produce the Ruby on Rails Tutorial book (among others).