Aquí os dejo una muy buena lista de libros gratuitos sobre Javascript:
- Dive into HTML 5
- Developing Backbone.js Applications
- Single page apps in depth
- Up and Running with Node.js
- Mixu's Node book
- Javascript Garden
- jQuery Fundamentals
- JS in ten minutes
- Building A JavaScript Framework
- Master Space and time with JavaScript - The Basics
- The little MongoDB book
- The little Book on CoffeeScript
- HTML Canvas Deep Dive
- Javascript Guide
- JavaScript For Cats
- Testing with CoffeeScript
- Dynamisez vos sites web avec JavaScript !
- The Past, Present, and Future of JavaScript
- Javascript Design Patterns
- Javascript Enlightenment
- Writing Modular JavaScript With AMD, CommonJS & ES Harmony
- Smooth CoffeeScript
- Node Beginner
- Eloquent Javascript
- Building Browser Apps with Google Chrome
- DOM Enlightenment
- Mastering NodeJS
- JS The Right Way
- Programmin Windows 8 Apps
- CoffeeScript Cookbook
- Single page apps in depth