ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
React - A JavaScript library for building user interfaces
Famous Engine - The Famous Engine is a free and open source JavaScript rendering engine.
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Vue.js - Reactive Components for Modern Web Interfaces