CS-Map
FDO
Fusion
GDAL
GeoNetwork
GeoPrisma
Geoinformatica
GEOS
GeoTIFF
Generic Geometry Library
GRASS
Mapbender
MapGuide
MapServer
MetaCRS
OSGeo General
OSGeo4W
OSSIM
PostGIS
PROJ.4
Proj4js
Proj4J
Quantum GIS
Ubuntu GIS
.