Viking is a free/open source program to manage GPS data
Simple GPS tracking server
#3A - GPS assisted tracking device with GSM connectivity and a lot of
This is a port of LibRTK on C#, and into a small c/c++ library.
Aircraft navigator with HSI for TomTom devices
Visualize data from the opencellid.org project
PC/PocketPC tool to get tracklogs from the WBT-201 GPS logger