Databases (influxdb, mariadb, elasticsearch, neo4j) Monitoring stack (Prometheus, Grafana, AlertManager) All our company stateful applications
cStor (with and without mirror).
We are currently using it in our development and go in production with it.
Our organization (and personal uses too).
The goal was to be able to adapt the storage solution easily without too much knowledge about the solution. We don't want to hire a cloud administrator to handle the storage and configuration, instead we use a devops approach to simplify the process.
With OpenEBS it is easy to switch storage solution (cStor, localpv) when we need. We use OpenEBS on premise and the nodes won't have internet access once the solution is deployed so we couldn't used external cloud solution.
The configuration with Helm chart is well documented and easy to install. One thing that is missing, is a free UI to create cStor pools or partition disks or even update storage configuration.