Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
Earlybirds for preact is a wrapper around the earlybirds-js project and provides a set of components and helpers that'll facilitate the implementation of earlybirds.