c:geo - c:geo is simple yet powerful unofficial geocaching client for Android devices.
GooseChase - The Original Scavenger Hunt App
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
iCaching - iCaching is the all-in-one Geocache manager for the Mac.
Geocaching - Geocaching is the premier app for locating geocaches. This app is available for both the Android and iOS platforms, and it makes locating these popular hidden treasures easy and fun.