Pixi.js - Fast lightweight 2D library that works across all devices
Amtrak.js - Amtrak.js is a super simple and easy way to interact with the Amtrak's train tracking API in both Node.js and the browser.
Anime.js - Lightweight JavaScript animation library
Immutable.js - Immutable persistent data collections for Javascript which increase efficiency and simplicity. - immutable-js/immutable-js
Glottologist - JavaScript translation framework
HeyForm - Paperless data collection with better data insights