- ScyllaDB
- Riak
- Couchbase
- Cloudflare KV
- Many different AWS offerings (DynamoDB, ElastiCache)
- Similar alternatives from Google & Azure if you are in those ecosystems
Of course there's nothing unique about a KV store. You can use literally any SQL or noSQL service out there, or set up your own in any way you want.
They also all have the advantage that you will get bindings for every language, not just Deno.