Cross platform (lin/win/mac) geographical information system (GIS)
LaMa - A Localization and Mapping library
Google Earth Enterprise - Open Source
Interactive visualization of plate tectonics.
Geostatistics and geosciences modeling software
Open Source Marine Chart Plotting Program
Interactive OpenGL map projection and navigation with geodetic utils.
Moved to new location: http://octomap.github.com/
In-flight navigation (and more) for private pilots (Linux).