The Rabbithole project is a web-based console for Neo4j, allowing users to run Cypher queries on an in-memory instance and visualize the results using d3.js. The app supports importing and modifying graph data, and provides features such as sharing links and embedding live consoles into documentation. It is deployed on Heroku and available on GitHub, offering possibilities for sharing graph setups, embedded visualizations, and more interesting visualizations like geographic rendering and Hiveplots.