The digital version over at https://map.geo.admin.ch/ has existed for many years but it is only a few years now that all Cantos have agreed to provide the data for free[1]. There is a lot of interesting data such as "Lärmbelastung" where you can lookup how loud car or rail traffic is at a location.
[1] https://www.geo.admin.ch/en/general-terms-of-use-fsdi