Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.
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Apache Pulsar - distributed pub-sub messaging system
Open source RabbitMQ: core server and tier 1 (built-in) plugins
Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots
Efficient reliable UDP unicast, UDP multicast, and IPC message transport
Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.
Apache ActiveMQ
JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.
HiveMQ CE is a Java-based open source MQTT broker that fully supports MQTT 3.x and MQTT 5. It is the foundation of the HiveMQ Enterprise Connectivity and Messaging Platform
Framework for building Event-Driven Microservices
Apache Artemis
Fast and reliable message broker built on top of Kafka.
Java client for NATS
JSON-RPC 2.0 implementation over WebSockets for Node.js and JavaScript/TypeScript
Messaging patterns for Backbone applications.
An open source, a high-performance hybrid integration platform that allows developers quick integration with any application, data, or system.
Tinode web chat using React
Highly optimized, extremely modular and very flexible XMPP/Jabber server
Emissary is simple, yet 🗲FAST🗲 messaging library for decoupling messages (requests and events) and message handlers 🚀
Kommunicate Android AI Agent SDK
Mirror of Apache Qpid Broker-J
Gatling plugin for AMQP/RabbitMQ — publish, request-reply, and consume patterns with connection pooling