- async
Higher-order functions and common patterns for asynchronous code
- qs
A querystring parser that supports nesting and arrays, with a depth limit
- http
- semver
The semantic version parser used by npm.
- glob
a little globber
- path
- mime-types
The ultimate javascript content-type utility.
- readable-stream
Streams3, a user-land copy of the stream library from Node.js
- debug
small debugging utility
- Top 12 Jupyter Notebook extensions