The ultimate Free Open Source Solution for team communications.

A customizable life embetterment robot.

Zulip server - powerful open source team chat

💬 The most complete chat UI for React Native

The open-source Conversational Platform with built-in language understanding (NLU), beautiful graphical interface and dialog manager. Easily create chatbots and AI-based virtual assistants.

微信助手：1.每日定时给好友发送定制消息。2.机器人自动回复好友。3.群助手功能（例如：查询垃圾分类、天气等）

Keybase Go Library, Client, Service, OS X, iOS, Android, Electron

💬 Unofficial WeChat client built with React, MobX and Electron.

Elegant Facebook Messenger desktop app

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

Desktop chat client for Google Hangouts

Chat over SSH.

QQBot: A conversation robot base on Tencent's SmartQQ

This is a native iOS Messenger app, with audio/video calls and realtime chat conversations (full offline support).

Conversations is an open source XMPP/Jabber client for the Android platform

💬 Modern, responsive, cross-platform, self-hosted web IRC client

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

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

Web-based XMPP/Jabber chat client written in JavaScript

Private messaging system that hides metadata

Instant messaging server; backend in Go; Android, web command line clients; chatbots

🤖 A JavaScript framework to create conversational UIs

HTPC/Homelab Services Organizer - Written in PHP

Errbot is a chatbot, a daemon that connects to your favorite chat service and bring your tools and some fun into the conversation.

Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, AIM/ICQ, IRC and many other useful features.

An interesting chat application power by socket.io, koa, mongodb and react

【重要通知：WebQQ将在2019年1月1日停止服务，此项目目前已停止维护，感谢大家四年来的一路陪伴】使用Perl语言（不会没关系）编写的smartqq/webqq客户端框架（非GUI），可通过插件提供基于HTTP协议的api接口供其他语言或系统调用

The extensible chat client.

Open-source XMPP client for Android

the first third-party instant messaging client for Google Hangouts