What types of apps are you missing from the FOSS ecosystem?

Are there any FOSS apps which are able to bypass the native Android audio processing so that better on-board or external DACs can be used? Something similar to UAPP or Poweramp.

https://www.extreamsd.com/index.php/products/usb-audio-player-pro
https://powerampapp.com/

RootlessJamesDSP | F-Droid - Free and Open Source Android App Repository ?

I’ll check it out. It looks like it doesn’t play music directly but could allow other players to access. Thank you.

I would use and download a world map with digital scratch facility to enable me to record where I have been and where I want to go. Helpful if also did regions and/or cities of countries.

OSMAnd, Organic Maps, CoMaps, all have ā€œfavoritesā€

True but does not seem very user friendly.