Buzz
Buzz is a small but powerful Javascript library that allows you to easily take advantage of the new HTML5 audio element. It tries to degrade gracefully on non-modern browsers.
Air Datepicker
Cool jQuery datepicker
Nock
HTTP mocking and expectations library
Autosize
jQuery plugin for dynamic textarea sizing
Tock
Timer Object/Class. Kickass!
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Processing.js
A port of the Processing visualization language to JavaScript.
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Ladda
Buttons with built-in loading indicators.
Joint
JavaScript diagramming library
Grunt
Grunt: The JavaScript Task Runner
Croppie
A Javascript Image Cropper
Alchemy
Alchemy.js is a graph drawing application built in d3.
Svg.js
A lightweight library for manipulating and animating SVG
Remodal
Flat, responsive, lightweight, easy customizable modal window jquery plugin with declarative state notation and hash tracking.
Materialize
Materialize, a CSS Framework based on Material Design
Angular.js
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly