Heroku has released a Neo4j-Graph Database Add-On, making it available to all registered beta-testers of the Heroku PAAS platform. This add-on allows users to store and query interconnected data using a graph database, which is well-suited for object networks with dynamic domains. The add-on provides hosted Neo4j servers, with generous amounts of RAM, and can be easily added to applications using the `heroku addons:add neo4j:test` command. Users can access their Neo4j instance via a REST URL or the Neo4j Web Administration UI, and can manage their graph database using various features such as node properties, relationships, and backups. The add-on is currently available for free with the test plan, and users can start exploring larger graphs right away.