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Gadgetbridge lets you connect and get data from supported smart or fitness watch without manufacturers app. Completely local.
Kde connect on my phone (iphone) and laptop.
Definitely Syncthing.
Great app to sync my phone with my laptop.
I have an extensive syncthing set up but I find the mobile app a battery hungry
Syncthing-fork which fixes battery drain issue and others as well. I’ll just leave this here for your battery needs: https://f-droid.org/packages/com.github.catfriend1.syncthingandroid/