Starting with CrateDB v4.5.0 and from now on, Crate.io says farewell to its Enterprise License. Instead, all CrateDB features are now available in a single, open-source version licensed under Apache 2.0. This means that CrateDB is (and will continue to be) completely free if you run it on your own premises.
Crate.io will no longer use Elastic’s Elasticsearch as an upstream project for CrateDB and open source its entire codebase under the APLv2 with CrateDB 4.5
What are the 3 pillars of healthy open source communities? Recap of a panel discussion on open source in Berlin 2017