yargs the modern, pirate-themed, successor to optimist.
small debugging utility
Higher-order functions and common patterns for asynchronous code
parse argument options
Recursively mkdir, like `mkdir -p`
fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as mkdir -p, cp -r, and rm -rf.
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
A library for promises (CommonJS/Promises/A,B,D)
Node.js body parsing middleware