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Gajim is a fully-featured decentralized XMPP client that allows you to connect to your contacts using a server of your choice. It is open-source and uses end-to-end encryption using OMEMO, PGP, or OpenPGP.

Delta Chat is a messenger that uses the most decentralized communication system: the e-mail server network. Use your standard e-mail account and start chatting with any of your e-mail contacts, whether they have installed Delta Chat or not.

Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe way to communicate. Unlike traditional messaging apps, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices.

Status is a secure messaging app, crypto wallet, and Web3 browser. It uses an open-source, peer-to-peer protocol and end-to-end encryption to protect your messages from third parties.

Signal is a cross-platform encrypted messaging app that allows private sharing of text messages, voice messages, photos, videos, GIFs, and files.