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1List is the best list-making app I've tried that's open source. Really polished and quick.
https://f-droid.org/en/packages/com.lolo.io.onelist/
Along those same lines, Notally is the best note taking app I've tried.
https://f-droid.org/packages/com.omgodse.notally/
And since someone else mentioned Voyager, I'll mention Eternity as well!
https://f-droid.org/packages/eu.toldi.infinityforlemmy/
Lastly, Weawow is the best weather app I've used, though Quickweather on f-droid is a close second (but requires an API key to work, so bit of a hassle to set up).
https://play.google.com/store/apps/details?id=com.weawow&hl=en-US
I like the look of both of these but do you know a way to sync them with a PC?
I don't believe so. The only options I see in the settings is the ability to export and import lists and notes manually with a file.
You can use Syncthing (the fork on FDroid is better) and Obsidian (for the notes). You can also use obsidian services (might be paid) for the sync but its easy enough to do yourself.