Processing.js
A port of the Processing visualization language to JavaScript.
P5.js
A JS client-side library for creating graphic and interactive experiences, based on the core principles of Processing. http://twitter.com/p5xjs —
Obelisk.js
JavaScript Engine for Building Isometric Pixel Element with HTML5 Canvas
Drawingboard.js
A canvas based drawing app that you can integrate easily on your website.
Vintage JS
vintageJS - add a retro/vintage effect to images using the HTML5 canvas element
Html2canvas
Screenshots with JavaScript
Chartist Js
Simple responsive charts
Mapmap.js
A data-driven API for interactive thematic maps
Raphael
JavaScript Vector Library
Comic.js
Cartoon style drawing for HTML5 Canvas & Raphael.js & D3.js & SVG.js
Go Js
All GoJS samples, extensions, and documentation
W Paint
jQuery Paint Plugin
Focal Point
A small set of CSS classnames to help keep images cropped on the focal point for responsive designs. Using only HTML/CSS, web authors can specify an image's focal point, which stays as the image's primary focus, while the image's available width changes on responsive webpages. Crop and re-size images depending on available width and let CSS to do all of the work, and without any JavaScript.
Ocanvas
JavaScript library for object-based canvas drawing.
Croppie
A Javascript Image Cropper
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Rimg
A responsive image solution for browsers that support mediaqueries. Pure javascript and no server-side code.