Briar is described as 'An open-source decentralized and encrypted messaging app even without internet connection via Wi-Fi and Bluetooth. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access is required' 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, iPhone, Windows and Mac apps. The best Briar alternative is Signal, which is both free and Open Source. Other great apps like Briar are Telegram, Element, SimpleX Chat and Wire.
Meshtastic is a project that enables you to use inexpensive LoRa radios as a long range off-grid communication platform in areas without existing or reliable communications infrastructure. This project is 100% community driven and open source!
An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features.
Cwtch - (a Welsh word roughly translating to “a hug that creates a safe place”) is a decentralized, privacy-preserving, multi-party messaging protocol that can be used to build metadata resistant applications.
Decentralized messenger featuring end-to-end encryption for individual and group chats, no registration needed, no tracking or metadata logs, IP address protection, secure attachment sharing, multi-device sync, dark mode, open-source code, and ad-free use.
Anonimous, no need of email or phone number. E2EE, open source etc.
Status combines a private messenger, secure crypto wallet, and Ethereum Web3 DApp browser into one powerful communication tool. Chat with friends and growing communities. Buy, sell, store, and exchange digital assets.
Speek! is the first messenger that is anonymous and censorship-resistant by design. Speek! messenger encrypts all messages and is secure, private and decentralized.
SchildiChat is a Matrix client based on Element with a more traditional instant messaging experience.
VeilidChat is a 1-to-1, person-to-person text only chat application which serves as a technology demonstration for the Veilid application development framework. All communication is end to end encrypted, authenticated, private routed, and peer-to-peer. It's currently in early beta.
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Session works flawlessly on all my devices, it's great to keep your privacy.