With all the talk of #Signal and #distributed #IM lately, I thought I'd go a step further: here's a roundup of secure off-the-grid messengers: https://changelog.complete.org/archives/10205-roundup-of-secure-messengers-with-off-the-grid-capabilities-distributed-mesh-messengers These all use strong #encryption, provide #privacy, and can be used without any Internet connection at all.
#briar is an interesting hybrid; while it uses #Bluetooth instead of longer-range #LoRa, it doesn't need any extra hardware and can route IMs over #Tor, #Bluetooth, or local #Wifi (even w/o Internet). @briar