simplex-noise
simplex-noise is a fast simplex noise implementation in Javascript. Works in node and in the browser.
scale-color-perceptual
Javascript exports of matplotlib's new default color scales; inferno, magma, plasma and viridis. Works with browserify and D3.js
makerjs
Maker.js, a Microsoft Garage project, is a JavaScript library for creating and sharing modular line drawings for CNC and laser cutters.