EMQX is a high-performance MQTT broker and IoT messaging platform with clustering, security controls, a SQL rules engine, and integrations to databases and event systems.

16.6k stars2.5k forkslast commit Actively maintained

Managed real-time messaging service built on Centrifugo. Provides WebSocket and Server-Sent Events pub/sub for live updates, chat, notifications and presence, with hosted infrastructure, authentication, channel management and monitoring.
EMQX is a high-performance MQTT broker and IoT messaging platform with clustering, security controls, a SQL rules engine, and integrations to databases and event systems.

16.6k stars2.5k forkslast commit Actively maintained
Open-source, Go-based real-time messaging server for pub/sub and live updates; supports WebSocket, SSE, gRPC and brokers (Redis, NATS) with official SDKs.

10.6k stars723 forksApache-2.0last commit Actively maintained
ejabberd is an Erlang/OTP-based messaging server providing XMPP chat and presence, MQTT broker capabilities for IoT, and SIP services for real-time communications.

6.7k stars1.5k forkslast commit Actively maintained
AnyCable is a realtime server for reliable two-way communication over WebSockets and SSE, designed to power chats, notifications, presence, and streaming updates for any backend.

2.4k stars122 forksMITlast commit Actively maintained
A protocol gateway that bridges users across different instant messaging networks using libpurple adapters, enabling cross-network chat and presence.

418 stars92 forkslast commit Actively maintained
Scalable, modular XMPP/Jabber server written in Java supporting TCP, BOSH, WebSockets, federation, components, HTTP API and push notifications.

358 stars111 forksAGPL-3.0last commit Actively maintained
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 6 of 6 shipped a commit in the last six months. Licences in this list: Apache-2.0, MIT, AGPL-3.0. In exchange you take on hosting, backups and updates yourself.
Browse everything in Messaging & Event Streaming (Brokers/Queues).