Abc-Map is a free and open source mapping software. With Abc-Map you can easily create, edit and visualize geospatial information. You can export maps to PDF or share them online and even embed them in your websites. Abc-Map works on all platforms with a web browser (Linux, Mac OSX, Android, IOS, Windows). (GPL)
Cross-platform
KGeography is a geography learning tool, which allows you to learn about the political divisions of some countries (divisions, capitals of those divisions and their associated flags if there are some). (GPL)
Linux - FreeBSD
Marble is a generic geographical map widget and framework that is meant to be used by KDE4 applications. (LGPL)
Linux - FreeBSD
World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there. (NOSA)
Windows
4 applications