Streams3, a user-land copy of the stream library from Node.js
Redis client library
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
Simplified HTTP request client.
fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as mkdir -p, cp -r, and rm -rf.
yargs the modern, pirate-themed, successor to optimist.
A logger for just about everything.
A tiny wrapper around Node.js streams.Transform (Streams2/3) to avoid explicit subclassing noise