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.
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Briar
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
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
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