Simple responsive charts
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
A JS client-side library for creating graphic and interactive experiences, based on the core principles of Processing. http://twitter.com/p5xjs —
A lightweight library for manipulating and animating SVG
A renderer agnostic two-dimensional drawing api for the web.
2D physics engine for games
Jcrop (official) - Image Cropping Plugin for jQuery
jQuery plugin for 'responsive cropping'. Dynamically crop images to fill available space without cutting out the image's subject. Great for full-screen images.
qrcode generation standalone (doesn't depend on external services)