Image source: https://medium.com/@nishancw/audio-visualization-in-javascript-with-p5-js-cf3bc7f1be07
P5.js
17.10: Sound Visualization: Radial Graph - p5.js Sound Tutorial
17.11: Sound Visualization: Frequency Analysis with FFT - p5.js Sound Tutorial
Processing:
17.4: Amplitude Analysis - p5.js Sound Tutorial
Using Processing for Music Visualization
Unity:
Audio Visualization - Unity/C# Tutorial [Part 0 - Result]
Advanced:
Audio analysis for advanced music visualization pt.1
Course: