React - A JavaScript library for building user interfaces
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Angular.io - Angular is a JavaScript web framework for creating single-page web applications. The code is free to use and available as open source. It is further maintained and heavily used by Google and by lots of other developers around the world.
Vue.js - Reactive Components for Modern Web Interfaces
Koa.js - Next generation web framework for node.js
Backbone.js - Give your JS App some Backbone with Models, Views, Collections, and Events