1. 2023. Ariadne GPS. https://www.ariadnegps.eu/ 2023. Ariadne GPS. https://www.ariadnegps.eu/
2. 2023. BlindSquare. https://www.blindsquare.com/ 2023. BlindSquare. https://www.blindsquare.com/
3. 2023. Clew. http://www.clewapp.org/ 2023. Clew. http://www.clewapp.org/
4. 2023. Google Maps. https://www.google.it/maps/ 2023. Google Maps. https://www.google.it/maps/
5. 2023. Lazarillo. https://lazarillo.app 2023. Lazarillo. https://lazarillo.app