The Geocache Navigator application for GPS-enabled cellphones provides hours of entertainment by combining the technology in your phone with one of the fastest growing international hide and seek games, called Geocaching. Geocache Navigator uses the GPS and Internet built into your phone to create a seamless and exciting experience.
You need RoboGEO, a "software only" solution for Geocoding photos with latitude and longitude information. It provides the same functionality as a GPS camera, but without the bulk, expense, inconvenience, and hassle of wiring the two together. Requires registration.
Watcher is a program that lets you view GPX files obtained from Pocket Queries (a membership benefit for Geocaching.com members). Offline viewing. filtering, and sorting are all possible, as well as merging multiple GPX files and outputting custom GPX files.
GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data.
The Geocache Rating Calculator has been designed to help calculate the difficulty and terrain rating of a Geocache.
GeoBuddy displays all of the Geocaches in your area, as well as your own personal GPS data, over USGS topo maps, aerial photos, and your own scanned paper trail and road maps. A built-in Web browser lists all of the information about each Geocache, including pictures and hints left by the cache owner, and logs by recent visitors to the Geocache.
Here are various tools for Geocaching from Rick Richardson which you can use in a batch or cron mode to establish your normal caching routine, backup your caches and cache logs, etc. Others are used to enter new waypoints, a free geocoder, create custom maps of waypoints, etc.
GeoCoin Traq Pro is a Geocoin collection program developed by a Geocoin collector for Geocoin collectors. This software includes a database where you can easily and quickly record not only your coin collection, but will also contain a system for managing the coins that you are selling.
Looking4Cache is a iPhone and iPad App that comes with a large set of functions. It assist you while caching, by preparing your trip and by the finishing works. Particular attention is paid to offline abilities, easy handling and extensibility.
A little program to calculate all kinds of fun things, such as distances, projections, WAAS satellite positions, coordinate checksums, and geocaching.com cache numbers and waypoint names.