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Open-Source P2P Apps
(reddthat.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Tox is interesting, though potentially less secure than Briar as they rolled their own encryption and have not been audited (afaik).
check Session Messenger, uses a tor style server network https://github.com/session-foundation/session-android