OpenGPX is an application for paperless Geocaching for S60 mobiles and optionally on Windows/Linux machines. It's written in Python and uses several additional modules (python-gtk for Win32/Linux and python for S60 for mobiles).
Features:
Simple usage: download GPX files from Geocaching.com and copy it on your S60 phone to the folder E:\Geocaching (you have to be a Geocaching premium member to access GPX files)
Browse through all Caches
Show cache text incl. coordinates, country/state, difficulty/terrain, distance and heading from home
Show all waypoints (including extracted waypoints from the cache description and from logs)
Add user defined waypoints (e.g. calculated waypoints)
View waypoints (this enables invoking of a navigation or mapping application to directly navigate to a specific waypoint)
Export waypoints to the location database of the phone
Show all logs for the cache
Show travelbugs (only names)
Show cache hint
Show spoiler images (images are resized and rotated automatically).
Built in calculator, Geocaching de/encoder, Caesar chiffre en/decoder, Convert text to numbers (A=1, ...)
Show the content of a specific file ('info.txt'), e.g. for some user defined notes
Simple GPS View (showing heading, distance to the target waypoint etc.)