• JavaScript for Cats
• Professor Frisby's Mostly Adequate Guide to Functional Programming
• Eloquent Javascript (annotated)
• Speaking Javascript
• Exploring ES6
• Udemy - Javascript Understanding the Weird Parts (first 3.5 hrs)

• DevDocs
• OverAPI JavaScript Cheat Sheet
• ECMA-262

Find javascript libraries at http://jster.net

See Also: ➿ Quick JS | ⌚ Challenges | 🔧 Exercises | 📋 Editors | 📰 Blogs | 📚 Books

• REPL (node)
• JSBin
• CodePen
• CoderPad (pair programming) (Get Demo access forever 😄 )
• C9 (IDE, pair programming)
• Object Playground (visualize objects)
• Plunker

• Code Wars
• Hacker Rank
• Coding Game

• Codility
• Coderbyte
• Exercism

• Brackets
• Atom

• Perfection Kills
• 2ality

• Secrets of the JavaScript Ninja
• Programming JavaScript Applications
• Maintainable JavaScript
• Learning JavaScript Design Patterns
• Airbnb JavaScript Style Guide
• JSDoc
• Javascript Allonge Six

• Eloquent Javascript
  Fantastic, thorough introduction to the basics and features of Javascript, complete with in-browser interactive code

• Eloquent Javascript - The Annotated Version
  An annotated version of the above Eloquent Javascript with additional helpful comments and discussions to help clarify some sections that might be confusing to newcomers to programming

• Professor Frisby's Mostly Adequate Guide to Functional Programming
  Quite in-depth guide to Functional Programming in Javascript