Validatr
Cross Browser HTML5 Form Validation.
Underscore.db
Pure JavaScript database based on Underscore for Node, node-webkit and the browser
Swipebox
A touchable jQuery lightbox
Robotjs
Node.js Desktop Automation.
Resumable.js
A JavaScript library for providing multiple simultaneous, stable, fault-tolerant and resumable/restartable uploads via the HTML5 File API.
Quixote
CSS unit testing
Object.observe
Object.observe polyfill/shim trying to be compliant
Nprogress
For slim progress bars like on YouTube, Medium, etc
Konva
Konva.js is an HTML5 Canvas JavaScript framework that extends the 2d context by enabling canvas interactivity for desktop and mobile applications.
J Query.mmenu
The best jQuery plugin for app look-alike on- and off-canvas menus with sliding submenus for your website and webapp.
Intercooler Js
Making AJAX as easy as anchor tags
Html2canvas
Screenshots with JavaScript
Hide Seek
A simple, mobile-friendly, yet customizable quick/live search jQuery plugin.
Handlebars Helpers
A small collection of useful helpers for Handlebars.js
Flowplayer
The HTML5 video player for the web
Brjs
BladeRunnerJS (BRJS) is an open source development toolkit and framework for modular construction of large single-page HTML5 apps. It consists of a set of conventions, supporting tools and micro-libraries that make it easy to develop, test, deploy and maintain complex JavaScript apps.
Angular Fx
Angular CSS3 animation directives (ngfx-bounce, ngfx-shake, ngfx-flip, ngfx-pulse and more ...) https://720kb.github.io/angular-fx