aozorae / Edgechat

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. |

juggleim / im-server

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

Mininglamp-OSS / octo-server

🐙 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.

fonoster / routr

⚡ The future of programmable SIP servers.

NekroAI / nekro-nxt

NekroNXT：基于 DeepSeek Harness（DSH）的多平台群聊智能体系统｜A DSH-powered multi-platform group-chat agent system

TencentCloud / TIMSDK

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.

spacebarchat / server

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

movim / movim

Movim - Decentralized social platform

mk6i / open-oscar-server

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

tinode / chat

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

jitsi / jitsi

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

GoBelieveIO / im_service

golang im server

deltachat / deltachat-desktop

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

chatmail / core

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

KiWi233333 / JiwuChat

JiwuChat 🍂 - A lightweight cross-platform instant messaging app with integrated AI assistants (DeepSeek/Gemini/Kimi). Features real-time messaging, audio/video calls, multi-device sync, and customizable themes. Built with Vue3 & Tauri2 🍒

monal-im / Monal

Monal for XMPP (iOS and macOS)

miranda-ng / miranda-ng

Miranda NG: Next Generation of Miranda IM

im4codes / imcodes

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