Jquery Timeago
Timeago is a jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").
Machina.js
js ex machina - finite state machines in JavaScript
Scale App
scaleApp is a JavaScript framework for scalable One-Page-Applications
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts
Curl
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)
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
Uranium
Universal css-in-js media queries for React Native and React
Famous
Famo.us is a powerful JavaScript framework designed to build rich, interactive web applications. It is the only framework that provides an open source 3D layout engine fully integrated with a 3D physics-based animation engine that can render to DOM, Canvas, or WebGL. Famo.us is currently in public beta.
Bootstrap.native
If you are looking for Bootstrap without jQuery or vanilla Javascript for Bootstrap, this is the place to get started.
Lazy.js
Like underscore.js, but lazier
Canjs
Can do JS, better, faster, easier.
Stampit
Create objects from reusable, composable behaviors.
Hogan.js
A compiler for the Mustache templating language
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Prime
an OOP javascript library for node.js and the browsers
Regular
a living template engine that helping us to create data-driven component.
Inferno
An extremely fast, React-like JavaScript library for building modern user interfaces