Tauri is one I’m aware of.

One with roads coloured too would probably also be informative. And I feel like this could be scripted with openstreetmaps to make them for different cities and compare them…

“k’s” (pronounced “kays”) is also assumed to mean kilometres, at least in Australia and in context.

The website seems to work fine for me, but they seem to only support open hardware (e.g. Raspberry Pi or Mycroft). That doesn’t mean it wouldn’t work on other things though, especially with open software, but I wouldn’t be surprised if Echos require updates to be signed by Amazon, so it might require some hacking.