opendata.swiss is the central catalog of open government data for Switzerland, federating datasets from the Confederation, cantons, communes, and other public bodies. It serves as the single discovery point across Switzerland's federal structure.
Geodata is strongly represented, much of it published by swisstopo and cantonal GIS offices, and frequently available through OGC services as well as downloads. For authoritative national topographic mapping specifically, opendata.swiss is complemented by the swisstopo geo.admin.ch platform.
