Height maps

Swiss Topo: https://www.swisstopo.admin.ch/
Topographic Map: https://en-gb.topographic-map.com/maps/jgjh/Zurich/
Elevation Map: https://elevationmap.net/zurich
Elevation Map 2: https://elevation.maplogs.com/poi/z_rich_switzerland.21713.html
Floodmaps: https://www.floodmap.net/Elevation/CountryElevationMap/?ct=CH&st=ZH

World Machine:
Gryengine (Map Mesh): https://docs.cryengine.com/
Unity: https://unity3d.com/get-unity/download
Unreal Engine: https://www.unrealengine.com/
Autodesk: https://www.autodesk.es/

LibreCad: https://sourceforge.net/projects/librecad/files/latest/download
Sketchup: https://www.sketchup.com/download/all#