wire-android - :phone: Wire for Android

•    Java

This repository is part of the source code of Wire. You can find more information at wire.com or by contacting opensource@wire.com.You can find the published source code at github.com/wireapp/wire.

Signal-Android - A private messenger for Android, alternative to WhatsApp

•    C

Signal is a messaging app for simple private communication with friends. Signal uses your phone's data connection (WiFi/3G/4G) to communicate securely, optionally supports plain SMS/MMS to function as a unified messenger, and can also encrypt the stored messages on your phone.

Caprine - Elegant Facebook Messenger Desktop App

•    Javascript

Caprine is an unofficial and privacy focused Facebook Messenger app with many useful features. It has support for Work Chat: Messenger for Workplace, You can send code blocks by using Markdown syntax. It is built with Electron framework.

ejabberd - Robust, Scalable and Extensible XMPP Server

•    Erlang

ejabberd is a distributed, fault-tolerant technology that allows the creation of large-scale instant messaging applications. The server can reliably support thousands of simultaneous users on a single node and has been designed to provide exceptional standards of fault tolerance. As an open source technology, based on industry-standards, ejabberd can be used to build bespoke solutions very cost effectively.

Signal - Secure Messaging

•    Java

Signal sends high-quality group, text, voice, video, document, and picture messages anywhere in the world. Signal messages and calls are always end-to-end encrypted and painstakingly engineered to keep your communication safe.

meq - A modern messaging platform for Message Push、IM、IoT etc, based on MQTT protocol

•    Go

A modern messaging platform for Message Push、IM、Group Chatting、IoT etc, based on MQTT protocol. MeQ is written in pure go and standard library,nearly no messy dependencies. so you can easily deploy a standalone binary in linux、unix、macos、windows. Our goal is to be the best messaging platform in the world.

im_service - golang im server

•    Go

golang im server

Slackin - Public Slack organizations made easy

•    Javascript

Slackin is a little server that enables public access to Slack server. It is like Freenode but on Slack.

MobileIMSDK - 一个专为移动端开发的原创即时通讯框架，超轻量级、高度提炼，完全基于UDP协议，支持iOS、Android、标准Java平台，服务端基于Mina和Netty编写。

•    Objective-C

一个专为移动端开发的原创即时通讯框架，超轻量级、高度提炼，完全基于UDP协议，支持iOS、Android、标准Java平台，服务端基于Mina和Netty编写。

mpush - MPush开源实时消息推送系统

•    Java

MPUSH消息推送系统

RocketChat - The ultimate open source web chat platform

•    Coffeescript

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework. It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms. Its features include File sharing, Video conferencing, Screen sharing, Live chat, Link preview and lot more.

Tox - The future of online communications.

•    C

With the rise of government surveillance programs, Tox, a FOSS initiative, aims to be an easy to use, all-in-one communication platform that ensures full privacy and secure message delivery. Tox must use UDP simply because hole punching with TCP is not as reliable. However, Tox does use TCP relays as a fallback if it encounters a firewall that prevents UDP hole punching.

wechat_flutter - wechat_flutter Flutter版本微信，一个优秀的Flutter即时通讯IM开源库！

•    Dart

wechat_flutter Flutter版本微信，一个优秀的Flutter即时通讯IM开源库！

starrtc-android-demo - 🚀starRTC，即时通讯(IM)系统，免费IM系统（含单聊，群聊，聊天室，文件传输），免费一对一视频聊天，VOIP，语音对讲（回音消除），直播连麦，视频直播，RTSP拉流，RTMP推流，webRTC服务端，在线教育，白板，小班课，在线会议，视频会议，视频监控，局域网直连（无需服务器），兼容webRTC, 支持webRTC加速，P2P高清传输，安卓、iOS、web互通，支持门禁对讲，可视对讲，电视盒子，树莓派，海思，全志，任天堂switch，云游戏，OTT设备，物联网平台，C语言自研方案，支持二次开发成类微信，类映客等APP，✨万水千山总是情，来个star行不行✨，更多示例请访问：

🚀starRTC，即时通讯(IM)系统，免费IM系统（含单聊，群聊，聊天室，文件传输），免费一对一视频聊天，VOIP，语音对讲（回音消除），直播连麦，视频直播，RTSP拉流，RTMP推流，webRTC服务端，在线教育，白板，小班课，在线会议，视频会议，视频监控，局域网直连（无需服务器），兼容webRTC, 支持webRTC加速，P2P高清传输，安卓、iOS、web互通，支持门禁对讲，可视对讲，电视盒子，树莓派，海思，全志，任天堂switch，云游戏，OTT设备，物联网平台，C语言自研方案，支持二次开发成类微信，类映客等APP，✨万水千山总是情，来个star行不行✨，更多示例请访问：

Gitter - Community for Software Developers

•    Javascript

Gitter is designed to make community messaging, collaboration and discovery as smooth and simple as possible. You can easily create, organise and grow your communities, inviting others to join just in one click. Gitter is an instant messaging and chat room system for developers and users of GitHub repositories. Gitter is similar to IRC and Slack. Unlike IRC, and like Slack, it automatically logs all messages in the cloud.

riot-android - A glossy Matrix collaboration client for Android

•    Java

Riot is an Android Matrix client.This client is a standard android studio project.

Hubot - A Chat Bot for your Company

•    CoffeeScript

Hubot is a chat bot, modeled after GitHub's Campfire bot. It is extendable with community scripts and your own custom scripts, and can work on many different chat services.

Hublin - An easy and free video conference service

•    Javascript

Hubl.in is a free and open source video conference solution built with love and designed with ethics in mind. It's the best way to initiate a communication anywhere with anybody and brings real time conversation to the next level. Hubl.in allows free communication without additional plugins.

TLChat - 高仿微信

•    Objective-C

高仿微信，iOSAppTemplate代码重构。此版本TLChat基于TLKit、 ZZFLEX实现.

Telegram - Telegram for Android

•    Java

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. This repo contains the official source code for Telegram App for Android. We welcome all developers to use our API and source code to create applications on our platform. There are several things we require from all developers for the moment.