Reporter: [REDACTED]
Reason: requested one app per comment

Please don’t bother mods with piddlycomplaints like this.

KDE Connect! Share files, clipboard, links from one device to another, use your phone as a mouse or laser pointer.

HeliBoard, don't want google to get everything I type on their keyboard. KeePassDX - offline password manager

CoMaps. Google Maps alternative. Can save paths and do navigation with TTS. Gets its data from the amazing OpenStreetMap.

rquickshare This is not an app for the phone because it uses the app you already have by default (nearby share/quick share), it enables you to use it with your Mac or Linux computer on the same lan so you can share your clipboard and files. I like it a lot.

I use davx5 to sync my caldav calendar (radicale) with my Android.

accrescent is a great appstore with limited apps, my favourite is beautyxt and DNSnet, give it a try!

obligatory shilling for LocalSend, it's airdrop except open-source and completely cross-platform!

Tabs Lite let's you search for songs, fetches lyrics and tabs, chords from the web and stores them offline on your device. You can organize all the songs in playlists as well.
Edit: It's in IzzyOnDroid repository

https://f-droid.org/packages/com.trianguloy.urlchecker

url checker works as your mobiles default browser to easily edit links before opening them in a browser of your choice, I love this thing, I have given up trying to tell people about url hygene

Mindustry: one of the few great games on f-droid (tower defense)

AntennaPod Podcast player with awesome ui

FindMyDevice. Alternative to Google’s find my device. You send a text from a different phone number, and you can do things like get the GPS location, lock the device, erase the device, ring the device, or have the device take a picture of its location.