ArangoDB is free & open-source. But there is also a company behind it that offers support services also for ISV & OEM customers. With the additional Enterprise Edition users have more options in terms of security and scalability.
When your project goes live, ArangoDB offers subscriptions for dedicated support and contact to experts of the core team. Easy access to hot fixes and emergency patches ensure that your mission-critical applications stay up and running. ArangoDB offers architecture consulting and trainings, development support, as well as tailored service level agreements for production support.
In addition to the Community Edition, ArangoDB Enterprise includes SmartGraphs, Satellite Collections and many enterprise-level security features. It also comes with the ArangoDB Enterprise subscription, including comprehensive 24/7 support SLA.
ArangoDB Enterprise Edition is free of charge for evaluation.
ArangoDB Community Edition is native multi-model database written in C++ and available under open-source license (Apache 2). It stores key/value pairs, documents and graphs natively in one database core, and lets users access all data models with one declarative query language (AQL). All data models can be combined in a single query. ArangoDB provides a fault-tolerant cluster management based on the RAFT consensus protocol.