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
Redux
Predictable state container for JavaScript apps
Vue
Intuitive, fast & composable MVVM for building interactive interfaces.
Foundation
The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites and apps that work on any kind of device.
Ember
Ember.js is a JavaScript framework that does all of the heavy lifting that you'd normally have to do by hand. There are tasks that are common to every web app; Ember.js does those things for you, so you can focus on building killer features and UI.
Express
Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Webpack
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.
Meteor
Meteor, an ultra-simple, database-everywhere, data-on-the-wire, pure-Javascript web framework.
Axios
Promise based HTTP client for the browser and node.js
Underscore
JavaScript's utility _ belt
Backbone
Give your JS App some Backbone with Models, Views, Collections, and Events
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Lodash
An alternative to Underscore.js, delivering consistency, customization, performance, and extra features.
Sentry
Sentry is a realtime error logging and aggregation platform
Async
Async utilities for node and the browser
Rx Js
The Reactive Extensions for JavaScript