2016

Soundcloud Visualizer by Michael Bromley

Audio Visualization with Web Audio, Canvas and the Soundcloud API
2015

Waveform.js

Introducing Sunny for iPhone & iPad
(via)
Noizio – ambient sound equalizer for relax or productivity.
by 1 other
Surrounded by sound: how 3D audio hacks your brain | The Verge

The Ghost in the MP3
2014

Hush | Block out the world. Hear what you need.
(via)
Jasper | Control everything with your voice
(via)
@GreWeb - Beez, WebRTC + Audio API

TypedArray.org | JavaScript for interactive developers

wavesurfer.js

All this is done in HTML5 by the way.

Web audio: Filter Playground

Exploring the HTML5 Web Audio: visualizing sound | Smartjava.org
by 2 others (via)
Teoria.js - Music Theory in JavaScript
(via)
Badass JavaScript
by 3 others2013

unconed/ThreeAudio.js

Making Audio Reactive Visuals — Airtight Interactive
