- async
Higher-order functions and common patterns for asynchronous code
- semver
The semantic version parser used by npm.
- mocha
simple, flexible, fun test framework
- readable-stream
Streams3, a user-land copy of the stream library from Node.js
- q
A library for promises (CommonJS/Promises/A,B,D)
- cheerio
Tiny, fast, and elegant implementation of core jQuery designed specifically for the server
- js-yaml
YAML 1.2 parser and serializer
- yargs
yargs the modern, pirate-themed, successor to optimist.
- postcss
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