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, Google Earth, OsmAnd and MAPS.ME.