Jimp
An image processing library written entirely in JavaScript for Node, with zero external or native dependencies.
Tinymce
TinyMCE is a JavaScript library for platform independent 'WYSIWYG' or rich text editing. It is released as open source under the LGPL.
Ol3
OpenLayers 3
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Fastclick
Polyfill to remove click delays on browsers with touch UIs
Prism
Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.
Popmotion
A 12kb Javascript motion engine. Use for animation, physics and input tracking.
Fine Uploader
Multiple file upload plugin with progress-bar, drag-and-drop.
Scroll Reveal.js
Declarative on-scroll reveal animations.
RequireJS
A file and module loader for JavaScript
Knockout
Knockout makes it easier to create rich, responsive UIs with JavaScript
Mojs
motion graphics library for the web
Mjml
MJML: the only framework that makes responsive-email easy
Aos
Animate on scroll library
Mathjs
An extensive math library for JavaScript and Node.js
Mediaelement
HTML5 <audio> or <video> player with Flash and Silverlight shims that mimics the HTML5 MediaElement API, enabling a consistent UI in all browsers.