Jcrop (official) - Image Cropping Plugin for jQuery
qrcode generation standalone (doesn't depend on external services)
Simple isometric graphics library for HTML5 canvas
jQuery plugin for 'responsive cropping'. Dynamically crop images to fill available space without cutting out the image's subject. Great for full-screen images.
A particle engine for html5
A canvas based drawing app that you can integrate easily on your website.
📐⚙ Library for creating 2D vector drawings for CNC and laser cutter machines.
BonsaiJS is a graphics library and renderer