Frontier uses several assets, located in /static that have different license terms.
The /audio folder contains sounds downloaded from Pixabay with appropriate license terms.
The Protomolecule font is from https://github.com/ThinkDualBrain/Protomolecule.
The /planets folder contains images from NASA and are used following their brand guidelines. NASA has not endorsed this project in any way.
All other images were generated or created by Joseph Gefroh.