Session is a private messaging app that protects your metadata, encrypts your communications, and ensures your messaging activities leave no digital trail behind. No phone number or email address is required to signup.
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.