These bindings can be used to make dynamic calls to any library that has GI annotations installed -- Jérémy said he was using it to generate PDFs from HTML.
fs (GitHub: matthewp / fs, License: MIT, component: matthewp/fs) by Matthew Phillips is a component that brings Node's fs module to the browser. It's designed to be cross-browser, with the FileSystem API for Chrome and IndexedDB for Firefox and Internet Explorer.
procjs (GitHub: vzaccaria / procjs, License: MIT, npm: procjs) by Vittorio Zaccaria is a set of command-line utilities for getting JSON representations from the output of ps. It also comes with a REST server that provides a JSON API for the same data.
The project is built with LiveScript, and can be invoked with jsps along with several arguments.