jQuery Paint Plugin
qrcode generation standalone (doesn't depend on external services)
A simple jQuery image cropping plugin.
Simple isometric graphics library for HTML5 canvas
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Simple responsive charts
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 lightweight library for manipulating and animating SVG
Clientside grayscale images on any browser