- commander the complete solution for node.js command-line programs
- mime A comprehensive library for mime-type mapping
- mkdirp Recursively mkdir, like `mkdir -p`
- node-uuid Rigorous implementation of RFC4122 (v1 and v4) UUIDs.
- q A library for promises (CommonJS/Promises/A,B,D)
- redis Redis client library
- socket.io node.js realtime framework server