Cross platform (lin/win/mac) geographical information system (GIS)
Viking is a free/open source program to manage GPS data
Handling and basic analysis of hyperspectral data in R
Interactive visualization of plate tectonics.
Analysis and display of Census, business, government attribute data
Geodesy based library (geodetic and geocentric functions)
Geostatistics and geosciences modeling software
Multiplatform Ham Radio APRS and Mapping Program
Simple example for triangulate polygon with allegro engine (C++)