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QGIS - QGIS is a desktop geographic information system, or GIS.
OpenCPN - 404 Please update your bookmarks and return to the home page.
Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
OpenSeaMap - OpenSeaMap - The free nautical chart
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
Ugrib - Our freeware application Ugrib allows instant and fully customizable access to global weather data.