A lightweight Promises/A+ and when() implementation, plus other async goodies.
Monadic streams
curl.js is small, fast, extensible module loader that handles AMD, CommonJS Modules/1.1, CSS, HTML/text, and legacy scripts.
shim.js is the a collection of UMD modules that shim (aka "polyfill") old environments to support modern (aka "ES5-ish" and "ES6-ish") javascript.
An AMD-compatible build tool.
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.