Lightgallery.js
Full featured javascript lightbox gallery. No dependencies.
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.
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
Flex Slider
An awesome, fully responsive jQuery slider plugin
Joint
JavaScript diagramming library
Beerslider
A vanilla JS keyboard accessible plugin for any before-after comparison
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Raphael
JavaScript Vector Library
Responsive Slides
Simple & lightweight responsive slider plugin (in 1kb)
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
Tremula Js
TremulaJS: Picture Streams + Momentum Engine + Bézier Paths + Multi-Device
Bonsai
BonsaiJS is a graphics library and renderer
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Svg.js
A lightweight library for manipulating and animating SVG
Scenejs
An extensible WebGL-based engine for high-detail 3D visualisation
Processing.js
A port of the Processing visualization language to JavaScript.
Lightslider
JQuery lightSlider is a lightweight responsive Content slider with carousel thumbnails navigation