Selene is described as 'Comprehensive peer-to-peer chat and file sharing application built on the Tor network. It enables secure, private communication and seamless file transfers between users, leveraging the anonymity and resilience of Tor' and is a instant messenger in the file sharing category. There are more than 25 alternatives to Selene for a variety of platforms, including Linux, Android, Mac, Windows and iPhone apps. The best Selene alternative is Signal, which is both free and Open Source. Other great apps like Selene are Matrix, Tox, Stoat Chat and bitchat.
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.
Tinfoil Chat (TFC) is a FOSS+FHD peer-to-peer messaging system that relies on high assurance hardware architecture to protect users from passive collection, MITM attacks and most importantly, remote key exfiltration.
A peer to peer private anonymous and secure messenger that works over Tor.
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.
Retro AIM Server is an instant messaging server that revives AOL Instant Messenger (and ICQ!) clients from the 2000s.
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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