Here are some programs I have developed which you can download and use for free:-
1) KMZFactory is a program for making Custom Maps for use on Garmin GPS devices
2) GMT - a tool for calculating moving time for Garmin GPS fitness devices
3) Navigator is a program for viewing images and movies as a full screen slideshow on a PC.
4) Mittelrhein Maps and places in the Mittelrhein region in GoogleEarth/Garmin format.