yargs the modern, pirate-themed, successor to optimist.
A tiny wrapper around Node.js streams.Transform (Streams2/3) to avoid explicit subclassing noise
Tiny millisecond conversion utility
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
Full featured Promises/A+ implementation with exceptionally good performance
The semantic version parser used by npm.