There are 51 repositories under messaging topic.
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.
An elegant messages UI library for iOS
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
即时通讯(IM)系统
Scalable real-time messaging server in a language-agnostic way. Set up once and forever.
Efficient reliable UDP unicast, UDP multicast, and IPC message transport
Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
A community-driven replacement for JSQMessagesViewController
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.
Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.
qTox is a chat, voice, video, and file transfer IM client using the encrypted peer-to-peer Tox protocol.
The most widely used PHP client for RabbitMQ
The most beautiful SMS messenger for Android
Anonymous peer-to-peer instant messaging
Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter
Android library. Flexible components for chat UI implementation with flexible possibilities for styling, customizing and data management. Made by Stfalcon
Apache Kafka® running on Kubernetes
ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.
A distributed MQTT message broker based on Erlang/OTP. Built for high quality & Industrial use cases.
signal-cli provides an unofficial commandline and dbus interface for signalapp/libsignal-service-java
Lightweight, fault-tolerant message streams.
Crossbar.io - WAMP application router