Node-noodles is a project mainly written in JAVASCRIPT and SHELL, it's free.
My entry (didn't make the deadline :() for Node Knockout 2011
The app displays a graph visualization of the dependencies between packages found in the main NPM package registry at npmjs.org. Uses the Express framework with Jade page templates. On the backend it uses MongoDB, which for the duration of the competition was hosted on MongoHQ. JSON REST API calls are made with restler.