Have you taken a look at nats? (https://nats.io/ https://nats.io/) Otherwise, the cloud native landscape has some similar projects listed in the same category

Have you taken a look at nats? (https://nats.io/ https://nats.io/) Otherwise, the cloud native landscape has some similar projects listed in the same category as kafka: https://github.com/cncf/landscape https://github.com/cncf/landscape