NNATS 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 PTim Jones (pg-boss project) · Messaging & queues
Node.js job queue that uses PostgreSQL tables and SKIP LOCKED for reliable background jobs, scheduling and retries without a separate broker
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026 RBroadcom · 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