jQuery - The Write Less, Do More, JavaScript Library.
React Native - A framework for building native apps with React
Modernizr - Modernizr is a JavaScript library which is designed to detect HTML5 and CSS3 features in various browsers.
Raven.js - Raven.js is a standalone JavaScript client for Sentry.
Babel - Babel is a compiler for writing next generation JavaScript.
ReactiveX - ReactiveX is a library for composing asynchronous and event-based programs by using observable sequences.