- chatwoot by chatwoot, 40k stars. Open source customer support inbox for live chat and email
- RevokeMsgPatcher by huiyadanli, 39k stars. Patch that keeps recalled messages in WeChat, QQ and TIM on Windows
- bitchat by permissionlesstech, 37k stars. Bluetooth mesh messenger for iOS and macOS with end to end encryption
- ntfy by binwiederhier, 36k stars. Send push notifications to phones and desktops with simple HTTP PUT or POST
- SmsForwarder by pppscn, 29k stars. Android app forwarding SMS, calls and notifications to chat apps and webhooks
- platform by hcengineering, 28k stars. All in one project management, chat, CRM and HR platform
- zulip by zulip, 26k stars. Self-hostable team chat server and web app with topic-based threads
- listmonk by knadh, 24k stars. Self-hosted newsletter and mailing list manager shipped as a single binary
- wechaty by wechaty, 24k stars. SDK for building chatbots on WeChat, WhatsApp and other platforms
- apprise by caronc, 18k stars. Python library that sends notifications to many services through one API
- OpenWA by rmyndharis, 17k stars. Self-hosted WhatsApp API gateway for sending and receiving messages
- mailinabox by mail-in-a-box, 15k stars. Scripted one-click install of a full mail server with SMTP and webmail
- mailcow-dockerized by mailcow, 14k stars. Mail server suite in Docker
- Signal-iOS by signalapp, 12k stars. Signal private messenger for iOS
- fluxer by fluxerapp, 11k stars. Open source chat and VoIP app for friends, groups and communities
- node-telegram-bot-api by yagop, 9.2k stars. Node.js client library for the Telegram Bot API
- HuLa by HuLaSpark, 7.8k stars. Cross-platform instant messaging app built with Rust and Vue 3
- waha by devlikeapro, 7.8k stars. Self-hostable REST API for WhatsApp, with several engine backends
- httpsms by NdoleStudio, 6.3k stars. Sends and receives SMS through an Android phone using an HTTP API
- macro by macro-inc, 6.3k stars. Team workspace combining email, chat, docs, tasks, calls and CRM with AI memory
- Telegram-X by TGX-Android, 6.2k stars. Alternative Telegram client for Android
- Unigram by UnigramDev, 5.5k stars. Telegram client for Windows
- DeskcommCRM by melgarafael, 5.4k stars. Self-hosted sales CRM with AI agents and WhatsApp integration via WAHA
- colanode by colanode, 5.2k stars. Local-first chat and knowledge base app, an alternative to Slack and Notion
- once-campfire by basecamp, 4.8k stars. Group chat you host yourself, from Basecamp
- zapfast by crmne, 4.5k stars. Native WhatsApp desktop client built with Rust and egui
- cumora by yetone, 4.2k stars. Cross-platform team chat app where AI agents appear as team members
- tgbot-verify by PastKing, 3.6k stars. Python Telegram bot that automates SheerID student and teacher verification
- Lagrange.Core by LagrangeDev, 3.0k stars. NTQQ protocol implementation in pure C#
- wacli by openclaw, 2.9k stars. Command line client to sync, search and send WhatsApp messages
- thefeed by sartoopjj, 1.7k stars. Reads Telegram and X feeds and sends encrypted messages over DNS queries only
- concord by chojs23, 1.7k stars. Terminal client for Discord written in Rust with ratatui
- open-oscar-server by mk6i, 1.6k stars. Self-hostable instant messaging server for classic AIM and ICQ clients
- databag by balzack, 1.5k stars. Self-hosted federated messenger light enough for small servers and Raspberry Pi
- boop by chrisgreg, 1.3k stars. Self-hosted inbox that pushes app events to your phone
- Haven by ancsemi, 1.1k stars. Self-hosted private chat server, a Discord alternative on your own machine
- evolution-go by evolution-foundation, 997 stars. Open source WhatsApp integration API server written in Go
- channels-sdk by CopilotKit, 956 stars. SDK to connect any agent to Slack, Teams, Discord and Telegram with interactive UI
- Hauk by bilde2910, 949 stars. Realtime location sharing server that you host yourself, written in Java
- briar by briar, 720 stars. Mirror of the Briar peer-to-peer encrypted messaging app source
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