HiveMQ

HiveMQ is a distributed MQTT broker engineered to move data between millions of IoT devices and enterprise systems with 100 percent message delivery.

This enterprise platform manages massive IoT deployments by supporting up to 10 million concurrent connections on a single cluster. It adheres strictly to MQTT 3 and 5 standards: ensuring seamless integration for brands like Audi and BMW. The broker features a robust extension system for direct data streaming into Kafka, MongoDB, or AWS (simplifying complex cloud architectures). Operators rely on its high-availability clustering to eliminate single points of failure and maintain sub-millisecond latency across global networks.

https://www.hivemq.com/