We have at least redis in rumprun-packages -- https://github.com/rumpkernel/rumprun-packages/tree/master/redis https://github.com/rumpkernel/rumprun-packages/tr

We have at least redis in rumprun-packages -- https://github.com/rumpkernel/rumprun-packages/tree/master/redis https://github.com/rumpkernel/rumprun-packages/tree/master/r... -- which AFAIK was packaged based on a non-toy need. Yes, the need for persistent storage for persistent values is quite solid ;-)