Versatile, yet easy to use. Use Marble similar to a desktop globe; pan around and measure distances. At closer scale it becomes a world atlas, while OpenStreetMap takes you to street level. Search for places of interest, view Wikipedia articles, create routes by drag and drop and so much more.
Note that this update will break the standard Stretch version of Digikam if you use that. I tried some builds of newer Digikams against this newer Marble, but it turns out the 64-bit versions won't start due to some libglib2.0 errors. I am trying to rebuild the Stretch version to be compatible, and we'll purge the newer Digikam if that works.