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How is this different from RabbitMQ?

There's a comparison page that includes RabbitMQ here: https://docs.nats.io/compare-nats

Any idea why ZeroMQ is missing in the article?

Maybe because the actual use of ZeroMQ varies a lot. Some brokerless-daisy-chain, some brokerless-mesh, some paired with brokers of different types (Zookeeper, RabbitMQ, others), and so on. So a comparison would be hard.

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