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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.
Logseq is better than Obsidian and open source