DataStax Luna is a subscription-based support service for Apache Cassandra, an open-source distributed database management system. It offers health checks and assistance with general and technical questions related to open-source Cassandra deployments. Supported versions include 2.1, 2.2, and 3.x, with plans designed to meet business and technical needs. Users can subscribe directly via the website using a credit card and receive immediate support from DataStax experts. Additionally, DataStax offers free tools like Apache Kafka™ Connector and DataStax Bulk Loader for Cassandra to simplify and speed up data loading and synchronization.