Briar is a free open source encrypted peer-to-peer messaging system. You can use it over the internet through @torproject or locally through wifi and bluetooth. You can follow the "not yet official" account at:
The Briar app is available from @fdroidorg and Google Play. A desktop PC app is in development.
The project website is at https://briarproject.org
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!