React
React is a JavaScript library for building user interfaces.
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.
Chart.js
Simple HTML5 Charts using the <canvas> tag
Ionic
Advanced HTML5 Mobile App Framework. A beautiful front-end framework for developing hybrid mobile apps in HTML5. Best friends with AngularJS.
Three.js
JavaScript 3D library.
Leaflet
JavaScript library for mobile-friendly interactive maps
Yarn
Fast, reliable, and secure dependency management.
Babel
Babel is a compiler for writing next generation JavaScript.
6to5
Turn ES6 code into readable vanilla ES5 with source maps
Socket.io
Realtime application framework for Node.JS, with HTML5 WebSockets and cross-browser fallbacks support.
Express
Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Moment
Parse, validate, manipulate, and display dates in javascript.
jQuery
jQuery JavaScript Library
Meteor
Meteor, an ultra-simple, database-everywhere, data-on-the-wire, pure-Javascript web framework.