CrateDB On-Premises is available as a free download. It is licensed under Apache 2.0 and since release v4.5 includes all CrateDB features, including former Enterprise only features. You can read more about all the advantages and features of CrateDB here. To get started smoothly, check out our documentation.
If you need support, we offer it through our community. We also offer paid enterprise support which comes with proactive, consultative support with regular check-ins, on-demand training from development to production. Our Customer Engineering is available 24x7 for an unlimited number of inquiries.