fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as mkdir -p, cp -r, and rm -rf.
Redis client library
Tiny, fast, and elegant implementation of core jQuery designed specifically for the server
Parse, validate, manipulate, and display dates
Streams3, a user-land copy of the stream library from Node.js
A querystring parser that supports nesting and arrays, with a depth limit
A logger for just about everything.
Simplified HTTP request client.
Handlebars provides the power necessary to let you build semantic templates effectively with no frustration