You spelled Germany wrong... X_x

Yes it does

Does it work on Linux?

This is a web-based app, so as long as you have a modern browser, yes it works on Linux :)

Try https://owntracks.org/

That page needs a bit of help. The call to action to install could be more front and center and the docs link is buried in the last sentence. Arguably the docs link is way more important than github or Twitter

Docs here: https://owntracks.org/booklet/

You might also want to have a look at fastd, which is quite small... https://projects.universe-factory.net/projects/fastd/wiki