Geocaching.com -  .

Airport Geocaching - - Guide to Geocaching for the Pilot. Hundreds of geocaches within walking distance of airports.

Buxley's Geocaching Waypoint - - Explanation of the sport, collection of recent news stories, maps of cache locations, a FAQ, and announcements of geocaching parties and events.

Geo-* - Linux tools for Geocaching - - Provides free Linux software for the activity.

Geocache Rating System - - Tool for helping geocachers rate the overall and terrain difficulty of their hidden caches.

Geocacher University - - Provides information about basic caches, equipment, events, resources, photos, items for sale and links.

Geocaching News and Information - - Information and news related to the hobby of geocaching and use of GPS.

Geommunity - - Dedicated to promoting and helping to build Geocaching communities through peer support and collective development of technical solutions. Includes downloads, FAQs, forums, archives and a members' list. Requires registration.

GeoSnapper - GPS Photography - - Enables users to upload and distribute accurately geo-referenced digital photographs using a camera and a GPS receiver.

GeoTrek Geocaching Services - - Provides full services for organizing geocaching events for families, corporate groups, private parties, and scouting organizations.

GPSgames.org - - Features a variety of games involving use of GPS receivers, including geocaching, geodashing, minutewar, geopoker and geogolf.

Handicaching - - Handicaching aims to improve the accessibility of Geocaching for physically handicapped people all over the world.

Local Geocache Groups - - Directory attempts to show all known local geocache groups from around the world.

MovingCache.com - - Features exciting point system to foster an environment of excitement while moving a cache to keep the game quite creativ.

Navicache - - Provides a wide range of information and listing resources for the geocaching enthusiast including worldwide cache listing.

TerraCaching - - Offers smaller amount of caches to acheive more challenging hunting with tools to empower even the new geocacher.