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Syncthing-friendly apps?
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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I use Obsidian for my notes and use SyncThing instead of their paid syncing option.
It's on F-Droid? Can't find it
Obsidian is not FOSS, I still use it because I find it to be the most complete note taking app. You can download it from the Aurora Store and disable the network permission, same on linux downloading it from Flathub and disable the network permission using Flatseal
Try Logseq its amazing