Well i guess I have to mention the wonderful Jerboa for Lemmy here!
Mitch, an unofficial itch-io client for android. The latest updates added a feature to download more games as webapps. (And to play them offline)
Transportr
this is indeed a beautiful public transport router! I do especially like sharing a planned route including emojis
Infinity
Loop Habit Tracker.
Nothing comes close on any platform.
Infinity 😭
Firefox Nightly (called Fennec on F-Droid)
Because it has support for uBlock Origin. Literally the only thing making browsing bearable on unrooted Android.
Does anyone know the difference between fennec and mull?
Mull is hardened version of firefox. With some configs of arkenfox. You could compare it to librewolf on desktop
Syncthing
indeed - wonder how i lived without it
F-Droid