Winlink basically does this. I'm unsure if there's software for other OS, but winlink is email-ish that is p2p on the backend, and can also be used point to poi

Winlink basically does this. I'm unsure if there's software for other OS, but winlink is email-ish that is p2p on the backend, and can also be used point to point. And don't tell anyone I said this, but if you have a real hardware modem for winlink you can get 3KB/second. It works on any frequency you can tune to. Also APRS, even though it seems like Google has a huge interest in it, is also a p2p communication network, running on 144mhz and 10mhz.