messaging

A realtime distributed messaging platform

An elegant messages UI library for iOS

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

Apache Pulsar - distributed pub-sub messaging system

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

An Open-Source, Cloud-Native, Distributed MQTT Message Broker for IoT.

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

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

Scalable real-time messaging server in a language-agnostic way. Set up once and forever.

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

A community-driven replacement for JSQMessagesViewController

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

Open source, native iOS Messenger, with realtime chat conversations (full offline support).

Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.

The most widely used PHP client for RabbitMQ

Distributed Application Framework for .NET

⚡️ A framework for building conversational user interfaces.

Anonymous peer-to-peer instant messaging

Android library. Flexible components for chat UI implementation with flexible possibilities for styling, customizing and data management. Made by Stfalcon

The most beautiful SMS messenger for Android

ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.

Apache Kafka running on Kubernetes

Private messaging system that hides metadata

A 100% native C# implementation of ZeroMQ for .NET

Messaging library for Python.

Lightweight, fault-tolerant message streams.