- https://osmdata.openstreetmap.de/data/water-polygons.html
- Terrarium (see also: https://github.com/gegy1000/Terrarium#data-attribution)
- https://visibleearth.nasa.gov/images/62208/northwestern-europe
- https://opengameart.org/content/seamless-beach-sand
The project's source code is licensed under Apache 2.0.
Aside from the fonts, which have their own licenses attached, assets are licensed under CC BY-SA 4.0.