Tone.js
A Web Audio framework for making interactive music in the browser.
Svg.js
A lightweight library for manipulating and animating SVG
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Onsen Ui
Custom Elements-Based HTML5 UI Framework for Building Your Mobile Front End
Typed.js
A jQuery typing animation script.
Raphael
JavaScript Vector Library
Parallax
Parallax Engine that reacts to the orientation of a smart device
Ol3
OpenLayers 3
Ratchet
Prototype iPhone apps with simple HTML, CSS, and JS components.
jQuery Pjax
pushState + ajax = pjax
Particles.js
A lightweight JavaScript library for creating particles
Magnific Popup
Light and responsive lightbox plugin with focus on performance.
Testcafe
A Node.js tool to automate end-to-end web testing.
Bootstrap Datetimepicker
Date/time picker widget based on twitter bootstrap
Editor
Next-gen, highly customizable content editor for the browser - based on React and Redux. WYSIWYG on steroids.
Pikaday
A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS