dancer.js : dancer.js is a high-level audio API, usable with both Mozilla's Audio Data API and Webkit's Web Audio API with flash fallback, designed to make sweet ...
Dropzone.js : DropzoneJS is an open source library that provides drag'n'drop file uploads with image previews.
Bliss.js : Want to use Vanilla JS but find native APIs a bit unwieldy? Bliss is for you
Wave.js : Audio visualizer library for javascript. Create dynamic animations that react to an audio file or audio stream.
howler.js : howler.js is an audio library for the modern web. It defaults to Web Audio API and falls back to HTML5 Audio.
JavaScript Libraries for adding offline support to web apps.