A mobile phone operating system based on the Linux kernel.
You can do some interesting stuff on it with Termux.
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I loaded up this title with buzzwords. The basic idea is that IM systems shouldn’t have to only use the Internet. Why not let them be carried across LoRa radios, USB sticks, local Wifi networks, and yes, the Internet? I’ll first discuss how, and then why.
Termux is a package that brings several things to Android: