switching.social#Briar is an unusual kind of messenger for Android devices: there are no servers, messages are stored on your phone and sent directly to your contact's phone through TOR, wi-fi or bluetooth.
It's designed for journalists, activists, people working in disaster zones and anyone interested in "off the grid" communication.
The official site is here:
The app is free, open source and available through @fdroidorg and Google Play.
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