Jimp
An image processing library written entirely in JavaScript for Node, with zero external or native dependencies.
Elastislide
Elastislide is a responsive image carousel that will adapt fluidly in a layout. It is a jQuery plugin that can be laid out horizontally or vertically with a pre-defined minimum number of shown images
Microfiche.js
A carousel library made With Associates, focusing on performance, simplicity and touch.
Lightgallery.js
Full featured javascript lightbox gallery. No dependencies.
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Isomer
Simple isometric graphics library for HTML5 canvas
Fotorama
A simple, stunning, powerful jQuery gallery. Licensed under the MIT.
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Nivo Slider
The Most Awesome jQuery Image Slider
Responsive Img
Responsive Img is a jQuery plugin that changes an image's src attribute based on its container's width.
Processing.js
A port of the Processing visualization language to JavaScript.
Joint
JavaScript diagramming library
Raphael
JavaScript Vector Library
Magnific Popup
Light and responsive lightbox plugin with focus on performance.
Flickity
:leaves: Touch, responsive, flickable carousels
Photoset Grid
A simple jQuery plugin to arrange images into a flexible grid, based on Tumblr's photoset feature.