jQuery Backstretch
Backstretch is a simple jQuery plugin that allows you to add a dynamically-resized, slideshow-capable background image to any page or element. The image will stretch to fit the page/element, and will automatically resize as the window/element size changes.
Html2canvas
Screenshots with JavaScript
Responsive Img
Responsive Img is a jQuery plugin that changes an image's src attribute based on its container's width.
Tremula Js
TremulaJS: Picture Streams + Momentum Engine + Bézier Paths + Multi-Device
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery
Responsive Slides
Simple & lightweight responsive slider plugin (in 1kb)
Raphael
JavaScript Vector Library
Scenejs
An extensible WebGL-based engine for high-detail 3D visualisation
Sequence
The Responsive Slider with Advanced CSS3 Transitions
Photoset Grid
A simple jQuery plugin to arrange images into a flexible grid, based on Tumblr's photoset feature.
Lightslider
JQuery lightSlider is a lightweight responsive Content slider with carousel thumbnails navigation
Beerslider
A vanilla JS keyboard accessible plugin for any before-after comparison
Svg.js
A lightweight library for manipulating and animating SVG
Sylvester
Vector, matrix and geometry math JavaScript
Intense Images
A simple library to view large images up close using simple mouse interaction, and the full screen.
FancyBox
FancyBox is a tool that offers a nice and elegant way to add zooming functionality for images, html content and multi-media on your webpages.