Scavenger - An augmented reality scavenger hunt for cash prizes
GSAK (Geocaching Swiss Army Knife) - GSAK is the all in one Geocaching and waypoint management tool.
Treasure Hunt - A scavenger hunt app for kids, powered by machine learning
c:geo - c:geo is simple yet powerful unofficial geocaching client for Android devices.
Detour - Immersive audio walks, now in 17 cities
iCaching - iCaching is the all-in-one Geocache manager for the Mac.