messaging

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.

Apache Pulsar - distributed pub-sub messaging system

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

An elegant messages UI library for iOS

Open source RabbitMQ: core server and tier 1 (built-in) plugins

即时通讯IM

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots

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

即时通讯(IM)系统

Scalable real-time messaging server in a language-agnostic way. 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

A community-driven replacement for JSQMessagesViewController

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

Distributed Application Framework for .NET

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

Open source alternative communication platform.

qTox is a chat, voice, video, and file transfer IM client using the encrypted peer-to-peer Tox protocol.