Something that looks pretty interesting, kinda combo nix - droid sort of.
https://wiki.debian.org/ChrootOnAndroid
Really interesting no matter what. Installed a terminal emulator on my cheapy Android phone, its funny messing with the thing. Installed busybox too but its not going to work on the thing natively w/o rooting it and atm dont want to even try. Did this before on a rooted device of course it was more fun to mess with then. Still lotsa cool and interesting parallels, maybe cross overs for gnu/nix + android on mobile. The AOSP (open source android) possibly.
Random weirdness: Folks can get mucho more open source on mobile just clearly made more difficult. Also folks tend to constantly gripe about Google but bottomline, they provide a lot of cool/useful services too. Ahhhh