- readable-stream
Streams3, a user-land copy of the stream library from Node.js
- ws
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
- minimist
parse argument options
- qs
A querystring parser that supports nesting and arrays, with a depth limit
- postcss
- q
A library for promises (CommonJS/Promises/A,B,D)
- bluebird
Full featured Promises/A+ implementation with exceptionally good performance
- mkdirp
Recursively mkdir, like `mkdir -p`
- semver
The semantic version parser used by npm.
- Top 12 Jupyter Notebook extensions