Geographic library
Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
A software package for quantitative analysis in Panbiogeography
Tool to work on map data, to check the data and generate your own maps
Plugins for OpenCPN
Geodesy based library (geodetic and geocentric functions)
FastVersion is a Qgis plugin for data versioning in a Postgis database
Multiplatform Ham Radio APRS and Mapping Program
Land survey field crew data management for .RAW and .JOB file types.
OTB is an open-source C++ library for remote sensing images processing
Some pythons plugins to enhance fantasy maps creation with QGis
A wildfire decision support system and visualization tool from Emxsys.