There is “Oscilloscope” which can show frequencies and their intensity

See https://f-droid.org/packages/org.billthefarmer.scope/

FitoTrack may be suitable for that.

If the Map is not fitting totally you can even correct it on OpenStreetMap.org by yourself

FitoTrack is a nice open source fitness tracker which shows the path on OpenStreetMap background. It logs position and speed data.

You can create a custom workout which shows you the current speed instead of average.

https://f-droid.org/packages/de.tadris.fitness/

What do you actually need it for?

https://github.com/ente-io/ente

Fully open source, End to End Encrypted alternative to Google Photos and Apple Photos

Don’t Panic!

Even Live Streams are working out of the box!

wow its amazing how many Operating Systems Freetube supports. I tried AppImage on Linux Mint. Download. Set execution bit. Starting. Start Watching! Amazing!

If you have some spare time you could start adding the missing house numbers. Easiest way is using StreetComplete on Android (https://f-droid.org/en/packages/de.westnordost.streetcomplete/)