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From F-Droid to emulators, here's who's hit hardest by Android's new verification rules
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Some of the OS is proprietary especially the android layer, the rest is open source which is based on linux Meego owned by Nokia. I believe quite a few of the Nokia guys went further into developing Sailfish Os. I find the Russian link ( also Votron) also a bit crap. But i dont like the heavy dependence of Google either...