GSAK (Geocaching Swiss Army Knife) - GSAK is the all in one Geocaching and waypoint management tool.
Hadur - HADUR is a free mobile location based multiplayer game for Android, iPhone, iPad and Windows Phones.
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.
Badge(r)s! - The game all about collecting, sharing and creating virtual swag!
c:geo - c:geo is simple yet powerful unofficial geocaching client for Android devices.
GeoEmpires - GeoEmpires is an Location Based game where you conquer real territories in your surroundings.