Microsoft Dynamic Proto Utility
Simply create or extend classes in JavaScript
BlendJS Object Oriented Class System For Node.JS
OOP for NodeJS with magic
Purejs is an API to help create constructors and manage their prototype chain.
Lightweight debugging utility for Node.js and the browser
Lodash modular utilities.
React is a JavaScript library for building user interfaces.
A querystring parser that supports nesting and arrays, with a depth limit
Higher-order functions and common patterns for asynchronous code
Babel compiler core.