Briar is described as 'Censorship-resistant peer-to-peer messaging that bypasses centralized servers. Connect via Bluetooth, Wi-Fi or Tor, with privacy built-in' and is a very popular instant messenger in the social & communications category. There are more than 50 alternatives to Briar for a variety of platforms, including Android, Linux, Windows, Mac and iPhone apps. The best Briar alternative is Signal, which is both free and Open Source. Other great apps like Briar are Element, Telegram, Matrix and Tox.
MeshCore is a lightweight, portable C++ library that enables multi-hop packet routing for embedded projects using LoRa and other packet radios. It is designed for developers who want to create resilient, decentralized communication networks that work without the internet.
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.
Hype is a chat service built into the Opera Mini browser, so you can chat, share, and browse in one app. And when you find something online worth sharing, Hype makes it easy to do so with WebSnap.
Norway
AzadiConnect is a cross-platform application designed for secure, anonymous peer-to-peer communication in restricted network environments. It allows users to chat and transfer files without relying on central servers.
all-in-one Communication and Collaboration Platform. The NYNJA platform combines the benefits of instant chat, video conferencing, screen sharing, file sharing, asset management collaboration, and much more, in one fast, easy and reliable platform.
United States
HookZApp is a cloud native, secure, fast, and feature-rich Next-Gen communication, collaboration & social media platform that makes everyday life, fun and easy.
Hong Kong SAR China
Selene is a 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.
Zerion is a secure messaging app and encrypted vault designed for people who need private, anonymous, censorship-resistant communication.
xat is a fun social networking site with the coolest online chat box. Make friends, join a group or run your own chat. Over 2500 unique smilies to combine and use. Embed to your blog or page for free (no need to download). Also available on mobile.
United Kingdom
Retro AIM Server is an instant messaging server that revives AOL Instant Messenger (and ICQ!) clients from the 2000s.
