Graph Messenger is an UNOFFICIAL messaging app that uses Telegram's API and add new features like real multi account system, download manager and time line.
Cost / License
- Free
- Proprietary
Platforms
- Android




Matrix is described as 'Open protocol for decentralized, end-to-end encrypted communication supporting instant messaging, VoIP, IoT, data persistence, and silos bridging over federated servers' and is a very popular instant messenger in the social & communications category. There are more than 100 alternatives to Matrix for a variety of platforms, including Android, Web-based, Linux, Windows and Mac apps. The best Matrix alternative is Signal, which is both free and Open Source. Other great apps like Matrix are Telegram, Element, Discord and Pidgin.
Graph Messenger is an UNOFFICIAL messaging app that uses Telegram's API and add new features like real multi account system, download manager and time line.




Meower is a free, open-source, and nonprofit social media platform. Meower is also a (currently WIP) alternative to Twitter, Discord, and Reddit, completely free of advertising, tracking, data collection, and more.


White Noise aims to be the most secure private chat app on Nostr, with a focus on privacy and security. Under the hood, it uses the Messaging Layer Security (MLS) protocol to manage group communications in a highly secure way.

Team chat, videoconferencing, screen sharing, file sharing, apps builder, process automation, integrations - with Tekos Collaboration & Automation




JANDI is a group-oriented enterprise messaging platform with an integrated suite of collaboration tools for workplace.




Fast open source Slack desktop app, written in Node.js with native UI powered by the Yue library.




Add contextual activity feeds, chat, and secure file sharing directly into your apps to increase user engagement, improve in-app retention, and reduce customer churn.



Fuse Chat is a Video Chat script userfriendly php socket.io script With is fully responsive design whatever if you are using a mobile a computer or even a tablet will always fit your screen and give you the best chat experience possible.

palava.tv is a cost-free, simple to use, secure, and open source platform for video calls. It is developed and operated by a charitable non-profit organization based in the EU. palava.tv runs directly in the web browser and its usage does not require a registration.

A fork of Signal for Android with proprietary Google binary blobs removed. Uses OpenStreetMap for maps and a websocket server connection, instead of Google Maps and Firebase Cloud Messaging.