Full featured Promises/A+ implementation with exceptionally good performance
Simplified HTTP request client.
A library for promises (CommonJS/Promises/A,B,D)
A querystring parser that supports nesting and arrays, with a depth limit
fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as mkdir -p, cp -r, and rm -rf.
Higher-order functions and common patterns for asynchronous code
Tiny, fast, and elegant implementation of core jQuery designed specifically for the server
The semantic version parser used by npm.