EventEmitter3 focuses on performance while maintaining a Node.js AND browser compatible interface.

A very tiny EventEmitter implementation for client- and server-side code.

HTTP Server framework

Node.js Streams, a user-land copy of the stream library from Node.js

yargs the modern, pirate-themed, successor to optimist.

Lightweight App extensibility and hookable middleware customization.

Lightweight debugging utility for Node.js and the browser

A simple CLI tool for ensuring that a given node script runs continuously (i.e. forever)

Framework-agnostic, micro-library for getting stack traces in all environments