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Additionally:

- Syncthing for phone-pc file transfer

- KeePassDX (and sync your kdbx file with syncthing!)

- OsmAnd~ OpenStreetMap viewer

- Tasks.org checklist (can be synced to a selfhosted etesync server)

- PDF Viewer Plus

- AnkiDroid

I'd never heard of Barinsta, and it is a surprisingly slick app. Thanks!

I recommend VLC as a music player app

Some more I can suggest:

- Password Store and OpenKeychain (pass+git client)

- Termux (terminal emulator etc.)

- Shelter (work profile/app cloning)

- LibreTorrent

Adding to the list:

- Simple gallery

- Openboard for keyboard

- KDE connect for sharing files and controlling your PC