Best Open-source Message Brokers & Queues tools

Apache Pulsar

Scalable, low‑latency pub‑sub platform for real‑time data streams

Apache Kafka

Scalable distributed event streaming platform for real‑time data pipelines

RabbitMQ

Robust multi-protocol messaging broker for cloud-native applications

BlazingMQ

High-performance, fault-tolerant distributed message queue for modern workloads

RobustMQ

High-performance multi-protocol messaging platform for cloud-native AI workloads

ElasticMQ

Lightweight SQS‑compatible message queue for testing and development

NSQ

Scalable, fault-tolerant messaging for billions of events daily

PGMQ

Lightweight PostgreSQL‑based message queue with exactly‑once delivery

SmoothMQ

SmoothMQ: Drop-in SQS replacement with UI, tracing, and scheduling