PCRaster environmental modeling software
A C library for parsing/normalizing street addresses around the world
Google Earth Enterprise - Open Source
Sight Reduction for Air Navigation with Python
Tools for reading, validating & writing transit schedule info in GTFS
Application to browse and visualize your GPS files
Track your mobile device or cellphone via internet using OpenGTS/GPRMC
Create cartographic map frames from an XML template
facilitating predictions of parameters using statistical models