Looking for CSI recommendation that is not backed by Kubernetes

I am looking for a recommendation for a CSI driver that uses a storage solution that is not backed by Kubernetes.

This is for a multi-node cluster running on metal. Any recommendation should be for a storage backed solution that is free.

I’ve used GlusterFS in the past and I know it’s an option, but I’m hoping there is something a bit more performant.

Thank you for any help!