Viking is a free/open source program to manage GPS data
Adjustment of local surveying networks, binary builds for Windows
Plugins for OpenCPN
GPS mapping and management software
Open Source Marine Chart Plotting Program
This is a port of LibRTK on C#, and into a small c/c++ library.
Multiplatform Ham Radio APRS and Mapping Program
OTB is an open-source C++ library for remote sensing images processing
HistoryLoc is a practical system to track place names over time.