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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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
Redis
Redis Ltd. · NoSQL & key-value stores
In-memory key-value data store used as cache, message broker and database, with data structures, Pub/Sub, Streams and, since Redis 8, built-in JSON, search and time-series modules
LicenseRef-RSALv2 OR SSPL-1.0 OR AGPL-3.0-onlyOpen sourceFreeSelf-hostedNov 2, 2026
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