What web technologies are involved in the sonarr project?

Im wondering what kind of web skills are involved in a project like this
i would like to one day be able to create something that involves torrents and automation(search/download… etc).

right now im learning html5 + css + javascript / jquery to be able to create my personal webpage, as a personal project…a hobbie of mine and im reading some books about these matters, the Jon Ducketts books as well watching some video courses on sites like pluralsight - lynda - tutsplus, among others

which languages and tools do the developers used to develop a thing like this?
can you recommend some good books to start learning?

The server side of things is written in C# (.net 4.0). The web front end is build with Backbone + Marionette (jQuery, underscore.js and other frameworks are also used).

I’ve never personally be a fan of books for learning to develop something like this, Stack Overflow is excellent if you have questions (probably already an answer on there). I learn best by working on something I’m interested in.