Fellow map nerds might also enjoy these:
The new "Light Base Map":
https://www.swisstopo.admin.ch/en/web-maps-light-base-map
Demo (Light Base Map):
https://cms.geo.admin.ch/fmc/lbm.html
This is a modernized version of a base map (used to overlay topical maps over it) that they have been working on for the past few years. Available as vector tile. It's very clean and crisp, and IMHO much more readable than e.g. the Google Maps style, or OSM.
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Highly customizable 3D map viewer (under development). Performance is a bit choppy, and navigation feels somewhat clunky. But you can overlay any of the hundreds of topical maps (pick from geocatalog menu, or search via search bar).
Example with hiking trails overlay: https://test.map.geo.admin.ch/#/map?lang=en&sr=3857¢er=8...