pixelmatch - The smallest, simplest and fastest JavaScript pixel-level image comparison library
A list of some interesting Open Source (mostly) Javascripts that hold good possibilities for knowledge production and publishing.
Interesting talk given at NYC D3js meetup showing some methods to clean up and maintain understandable code
Resemble.js analyses and compares images with HTML5 canvas and JavaScript.
Motion sensing requiring no special hardware, only a speaker and mic! Also, runs in the browser.
PEX is a set of JavaScript libraries for computational thinking in Plask/Node.js and WebGL in the browser.
BigPicture is like an infinite notepad, in which you can pan (north/south/east/west), but also in which you can ZOOM ! (Nearly) infinitely many times.
Vivus is a little JavaScript class (little because it's lightweight and have no dependency) to make drawing animation with SVGs in a webpage.
Vis.js is a dynamic, browser based visualization library. The library is designed to be easy to use, to handle large amounts of dynamic data, and to enable manipulation of and interaction with the data.