Apache Kafka
Apache Software Foundation · Messaging & queues
Distributed event streaming platform with durable, partitioned, replayable logs, Kafka Connect connectors and Kafka Streams processing
Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026
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Apache Spark
Apache Software Foundation · Analytical engines & OLAP
Distributed data processing engine with DataFrame and SQL APIs in Python, Scala, Java and R, plus structured streaming and MLlib
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
NATS
NATS project (CNCF; maintained principally by Synadia) · Messaging & queues
Lightweight Go messaging system with core pub/sub and request-reply plus JetStream persistence, key-value and object stores; a CNCF project
Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026
RabbitMQ
Broadcom · Messaging & queues
Open-source message broker in Erlang supporting AMQP 0-9-1 and 1.0, MQTT, STOMP and Streams, with routing, acknowledgements and quorum queues
MPL-2.0Open sourceFreeSelf-hostedNov 2, 2026
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