QGIS is a cross-platform open source Geographic Information System.
ArcGIS connects maps, apps, data, and people, giving you the ability to discover, use, make, and share maps.
OpenStreetMap is a map of the world, created by users and free to use under an open license.
Geocaching is an outdoor recreational activity, in which participants use a Global Positioning System receiver or mobile device and other navigational techniques to hide and seek containers, called "geocaches" or "caches", at specific locations marked by coordinates all over the world. Wikipedia
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