Marble is described as 'Virtual Globe and World Atlas that you can use to learn more about Earth: You can pan and zoom around and you can look up places and roads. A mouse click on a place label will provide the respective Wikipedia article' and is a popular Map service in the travel & location category. There are more than 25 alternatives to Marble for a variety of platforms, including Web-based, Android, iPhone, Windows and iPad apps. The best Marble alternative is CoMaps, which is both free and Open Source. Other great apps like Marble are Google Maps, OsmAnd, Google Earth and HERE WeGo.