[Maledictus]

Sadly CockroachDB is not open source anymore. Maybe take a look at TiDB.

[PhilippGille]

Not FOSS, but the core parts are 1. free and 2. on GitHub.

https://www.cockroachlabs.com/docs/stable/licensing-faqs.htm...

https://github.com/cockroachdb/cockroach