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berty
Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network
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InfluxDB
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First, I'd recommend Berty (https://berty.tech/) as opposed to Bridgefy due to security concerns and the fact that it is open-source. Berty can function over bluetooth just like Bridgefy, so it'll still work when the cell service goes down (albeit only at a short range).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.