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Google Fi lets me text and call people from my computer if i lose my phone (through Hangouts). Not sure there's a replacement for that.

There's also no drop-in replacement for the G-docs suit, nor for google-play of course. Firebase has no alternative.

Google got some pretty useful things up there.

There are some options like pushbullet that come close; but I think that relies on our phone being on and having a connection.