Berty is described as 'Secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network. Berty is a privacy-first messaging application built on top of the Berty Protocol' and is a instant messenger in the social & communications category. There are more than 25 alternatives to Berty for a variety of platforms, including Linux, Android, Windows, Mac and iPhone apps. The best Berty alternative is Signal, which is both free and Open Source. Other great apps like Berty are Matrix, Tox, Jami and Stoat Chat.
signal-cli is a commandline interface for the Signal messenger. It supports registering, verifying, sending and receiving messages. signal-cli uses a patched libsignal-service-java, extracted from the Signal-Android source code.
jami-commander (jc for short) is a simple but convenient CLI-based Jami client app for setting up accounts and swarms as well as sending.
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.
Smoke Messenger is an open-source Instant Messenger that is known as the first mobile Messenger worlwide using the encryption algorithm McEliece. To be downloaded at F-Droid.org or Github.com. Smoke provides with its own Server-Software: SmokeStack-Echo-Server.
ChatAround allows users to chat offline - no internet connection needed. It uses Bluetooth / WiFi to create a local connection. There is no account registration needed.
World's most secure P2P messenger. End-to-end encrypted, zero-server architecture, quantum-resistant roadmap. WebRTC direct connections, advanced ECDH + DTLS + SAS verification, full ASN.1 validation.
Retro AIM Server is an instant messaging server that revives AOL Instant Messenger (and ICQ!) clients from the 2000s.
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.
With Talkie (ex. Wi-Fi Talkie) you can organize communication between devices at distances of Wi-Fi signal without using an Internet connection or a cellular network.
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