GDAL: GDAL - Geospatial Data Abstraction Library. Welcome to the Quantum GIS Project. GDL - Center for Geographic Information - Geographic Data Library. Open Source GIS. Geocoder.us: a free US address geocoder. Geocaching - The Official Global GPS Cache Hunt Site. Waymarking - A scavenger hunt for unique and interesting locations in the world. Map My Run. Adobe Illustrator CS5.