messaging

bluetooth mesh chat, IRC vibes

A realtime distributed messaging platform

Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.

High-Performance server for NATS.io, the cloud and edge native messaging system.

SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!

The most scalable and reliable MQTT broker for AI, IoT, IIoT and connected vehicles

IM Chat OpenClaw

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

An elegant messages UI library for iOS

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, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.

Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Distributed Application Framework for .NET

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

A community-driven replacement for JSQMessagesViewController

Apache Kafka® running on Kubernetes

Kafka implemented in Golang with built-in coordination (No ZK dep, single binary install, Cloud Native)