QGIS - QGIS is a desktop geographic information system, or GIS.
OpenSeaMap - OpenSeaMap - The free nautical chart
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.
Open Nautical Charts - Open Nautical Charts offers free seacharts for everybody.
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.