osmlab
City of Bern (CH) WMS out of service
See also https://community.openstreetmap.org/t/update-needed-for-bern-web-map-services-in-osm-editor-layer-index/114852
The WMTS Bern-AmtlicheVermessung still works. All layers of the WMS which used to provide the aerial imagery Stadt Bern 10cm (2016) and Stadt Bern 10cm (2020) are now disabled, even though they are still listed on that website.
In Geodatenkatalog only downloads of extracts of small areas (to be delivered by e-mail) can be ordered, it seems.
But working WMS & WMTS URLs can still be obtained: Go to https://map.bern.ch/stadtplan/, click "Karten" at the bottom right, then for the wanted layer, click "Datenbezug". Click on the link "WMS" or "WMTS" in section "Service Schnittstellen". That'll open a modal dialog within the website displaying the WMS or WMTS URL, together with a button to copy it.
JOSM has a working URL for the newest available images from the city of Bern from 2023: https://josm.openstreetmap.de/wiki/Maps/Switzerland#StadtBern10cm2023
