Virtual Quoridor Board by Nicolas Frisby is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
I have not researched the licensing details of Quoridor. This website is intended as an assistant. You can explore game scenarios or use it to track an actual game you're playing on a physical board.
Contact me at nicolas dot frisby at gmail dot com with questions or comments. Enjoy!