instant-messaging

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.

IM Chat, High-performance, scalable, self-hosted instant messaging server in Go — private chat, groups, chatrooms, WebSocket and REST APIs.

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✨

Free Chat SDK (IM SDK) — 1,000 MAU/month free forever with push notifications & no concurrency limits. Build in-app messaging with chat API, UIKit & send message. Supports Android, iOS, Flutter, Web, React Native, uni-app, HarmonyOS & more.

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

Movim - Decentralized social platform

golang im server

🕊️ 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

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

完全运行于 Cloudflare Worker的现代聊天系统：实时通信、Telegram 双向桥接、消息与文件加密 A modern, self-hosted team chat built on Cloudflare — realtime messaging, Telegram bridge, encrypted messages & files, and WebMCP. |

A Tox-based instant messaging and video chat client.

🐙 The Go backend powering OCTO — an open workplace built for humans × AI agents. REST & WebSocket APIs, Lobster (AI agent) orchestration, and WuKongIM real-time messaging control plane.

The IM for agents. Shared Agent Context & Memory, supervised execution, and cross-agent audit across AI providers.

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