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

General IM UI components. Android/iOS/RectNative ready. 通用 IM 聊天 UI 组件，已经同时支持 Android/iOS/RN。

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

免费IM系统，IM即时通信消息系统(含一对一文字聊天，群聊，聊天室)，免费一对一voip实时通话，录屏，webrtc服务端，免费直播连麦，互动直播，视频直播，RTSP拉流，RTMP推流，语音对讲，免费在线会议，视频会议等服务端程序，支持物联网平台，✨万水千山总是情，来个star行不行✨

Chat SDK (IM SDK) — Build in-app messaging with chat API, UIKit & send message capabilities. Supports Android, iOS, Flutter, Web, React Native, uni-app, HarmonyOS & more. Features: one-to-one chat, group chat, message push, real-time messaging, offline push, chat UI components.

Spacebar server - A reimplementation of the Discord.com backend, built with Typescript and love

golang im server

Movim - Decentralized social platform

🕊️ The world's most advanced open source instant messaging engine for 100K~10M concurrent users https://turms-im.github.io/docs

Build your own chat UI with React components in few minutes. Chat UI Kit from chatscope is an open source UI toolkit for developing web chat applications.

⚡ The future of programmable SIP servers.

Chat SDK Android - Open Source Mobile Messenger

Decentralized private messenger with chat-shared tools and games for Desktop

A Tox-based instant messaging and video chat client.

Self-hostable instant messaging server compatible with classic AIM and ICQ clients written in golang. (Independently developed, not affiliated with or endorsed by AOL)

Chat SDK iOS - Open Source Mobile Messenger

Desktop client for Cabal, the p2p/decentralized/local-first chat platform.

Chatmail Rust Core library, used by Android/iOS/desktop chatmail apps, bindings and bots 📧

vscode qq extension based on android qq protocol

YiChat-基于tigase的独立IM系统