**mdBook** is a command line tool and Rust library to create books using Markdown. It's very similar to Gitbook but written in [Rust](http://www.rust-lang.org).
mdBook is free and open source, you can find the source code on [Github](https://github.com/azerupi/mdBook). Issues and feature requests can be posted on the [Github Issue tracker](https://github.com/azerupi/mdBook/issues).