If you happen to come skiing in Switzerland, there is a new option to display the relief with higher resolution thanks to the Federal Office of Topography swisstopo.
Before:
After:
The data is from SwissALTI3D. They are processed on-the-fly in your browser, so display can be quite slow and ressource-intensive.
Check also https://www.freemap.sk/#map=12/46.659925/8.446266&layers=X 🙂
Hmm nice !