React
React is a JavaScript library for building user interfaces.
Redux
Predictable state container for JavaScript apps
Vue
Intuitive, fast & composable MVVM for building interactive interfaces.
6to5
Turn ES6 code into readable vanilla ES5 with source maps
Babel
Babel is a compiler for writing next generation JavaScript.
Chart.js
Simple HTML5 Charts using the <canvas> tag
Moment
Parse, validate, manipulate, and display dates in javascript.
Axios
Promise based HTTP client for the browser and node.js
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
Yarn
Fast, reliable, and secure dependency management.
Leaflet
JavaScript library for mobile-friendly interactive maps
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.
Video.js
Universal video embed.
jQuery
jQuery JavaScript Library
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.
Gulp
The streaming build system