Discover the Best Open-Source Pubsub Projects Sorted by Stars

Dapr is a portable, event-driven, runtime for building distributed applications across cloud and edge.

Simple, secure & standards compliant web server for the most demanding of applications

Apache Pulsar - distributed pub-sub messaging system

Send push notifications to your phone or desktop using PUT/POST

The most scalable open-source MQTT broker for IoT, IIoT, and connected vehicles

🥊 Tiny 200 byte functional event emitter / pubsub.

ZeroMQ core engine in C++, implements ZMTP/3.1

Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably. Set up once and forever.

deepstream.io server

μWebSockets for Node.js back-ends :metal:

Broadcast, Presence, and Postgres Changes via WebSockets

Highly scalable realtime pub/sub and RPC framework

Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)

A Microservice Toolkit from The New York Times

High performance, distributed and low latency publish-subscribe platform.

Google Cloud Client Libraries for Go.

A micro library providing Ruby objects with Publish-Subscribe capabilities

A distributed MQTT message broker based on Erlang/OTP. Built for high quality & Industrial use cases. The VerneMQ mission is active & the project maintained. Thank you for your support!

Distributed in-memory object store. It can be used both as an embedded Go library and as a language-independent service.

Lightweight, fault-tolerant message streams.