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

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• Go

An elegant messages UI library for iOS

• UpdatedDec 12, 2018
• Objective-C

Telegram web application, GPL v3

• UpdatedOct 25, 2023
• JavaScript

Elegant Facebook Messenger desktop app

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• TypeScript

Free and Open Source messaging and emailing app that combines common web applications into one.

• UpdatedApr 21, 2022
• JavaScript

A community-driven replacement for JSQMessagesViewController

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• Swift

Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.

• UpdatedSep 24, 2025
• JavaScript

⚡️ A framework for building conversational user interfaces.

• UpdatedApr 10, 2024
• TypeScript

a free (libre) open source, mobile OS for Ethereum

• UpdatedDec 4, 2025
• Clojure

A high-performance IM server.

• UpdatedDec 17, 2025
• Go

A full featured Live Chat, Support & Marketing platform, alternative to Intercom, Drift, Crisp.

• UpdatedSep 23, 2025
• TypeScript

Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:

• UpdatedNov 20, 2025
• Python

Simple user messaging package for Laravel

• UpdatedMar 9, 2025
• PHP

Experimental Telegram web client with tdlib, webassembly and react js under the hood

• UpdatedFeb 23, 2025
• JavaScript

Modern XMPP ("Jabber") Chat Client using GTK/Vala

• UpdatedDec 13, 2025
• Vala

🌌 Your Self-hosted Comment System. | 自托管评论系统

• UpdatedJun 10, 2025
• Go

This is not an official Facebook product, and is not affiliated with, or sponsored or endorsed by, Facebook.

• UpdatedApr 12, 2018
• JavaScript

Timy - open source mobile app for groups to communicate and organize themselves. Built with flutter.

• UpdatedJan 9, 2023
• Dart