Edit: thanks for clarifying support for the Deck

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

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

Great, heard good things about OpenTTD! Do you game it directly on Steam Deck Controller or on Desktop with Mouse, Keyboard?

Thanks, I assumed so! :)

Great Game, for now i primarily play it on Android Phone. Easy to begin, but easy to die with one wrong click the game can be lost after hours of trying to get to the amulett!

Do you game it directly on Steam Deck Controller or on Desktop with Mouse, Keyboard?

Great Thanks for your write Up. I would love the idea that Steam Deck comes preinstalled with an Open Source Game like Xonotic!

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?

How to watch YouTube on Steam Deck? Via Desktop Mode?

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

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

Better put that into a spoiler!

I"ve found so far:

a DVD of The Core (2003)
a secret glade
a holographic Charizard business card
a marsh wren
a tumbleweed
a cool bug
a pretty leaf
11 squares packed into a larger square
a normal-looking leaf
an orb wren
a necklace of element samples whose symbols spell out your name
the Principality of Sealand
a rock with neat stripes
The Long Now Foundation's archive of every Animorphs book
a broken smoke machine
a friendly jumping spider
a spider-silk scarf
a block of scandium
a pair of platonic solids, not quite touching
a really cool data point
baby shoes (and baby)
a friend
two Andalites, one canonical
the Heart of the Ocean
a Rhode Island the size of an ant
a piece of pumice

How many items can be found?

Most delivery companies actually use OpenStreetMap in Europe. Especially if they deliver with bicycles, since OpenStreetMap has much more accurate mapping for bikes. Especially bike lanes and very often also smoothness, ground material. And also if bikes are allowed on the opposite direction of a one way street.