Photo Find - Navigate to the exact spot a photo was taken
iCaching - iCaching is the all-in-one Geocache manager for the Mac.
World Brush - AR app where you paint on the real world for others to find
c:geo - c:geo is simple yet powerful unofficial geocaching client for Android devices.
NoFilter - Discover great photo locations all over the world.
GSAK (Geocaching Swiss Army Knife) - GSAK is the all in one Geocaching and waypoint management tool.