Protovis : Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for vi...
Wave.js : Audio visualizer library for javascript. Create dynamic animations that react to an audio file or audio stream.
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...
darken : Easy control over your dark mode in a web environment
Crafty : JavaScript Game Engine, HTML5 Game Engine
Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.