Zero Clipboard : The Zero Clipboard library provides an easy way to copy text to the clipboard using an invisible Adobe Flash movie, and a JavaScript interface. The "Z...
Wave.js : Audio visualizer library for javascript. Create dynamic animations that react to an audio file or audio stream.
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
Band.js : An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.
Anime.js : Anime.js is a fast, multipurpose and lightweight JavaScript animation library with a simple, yet powerful API.
It works with CSS properties, SVG, DOM ...
The Closure Compiler, Library, Templates, and Stylesheets help developers create powerful and efficient JavaScript.