Try NATS @ https://nats.io
It's a single binary and can operate as a message bus, persistent queue, KV store, object store, provide services, and so on.
It's a single binary and can operate as a message bus, persistent queue, KV store, object store, provide services, and so on.
Otherwise I would really say it is more like the Postgres of queues (still great, but potentially not what OP is looking for)