GitBook is a command line tool (and Node.js library) for building beautiful programming books and exercises using GitHub/Git and Markdown. A book can contain interactive exercises. An exercise is a code challenge provided to the reader, which is given a code editor to write a solution which is checked against the book author’s validation code.
GitBook supports building books written in multiple languages. Each language should be a sub-directory following the normal GitBook format, and a file named LANGS.md should be present at the root of the repository.
Requirements: Node.js framework
Demo: http://www.gitbook.io/
License: Apache License