1. Google. Google maps platform (2018).
https://cloud.google.com/maps-platform/
2. Bing Maps (2019).
https://www.bing.com/maps
3. Here We Go (2019).
https://wego.here.com
4. MapQuest (2019).
https://www.mapquest.com/
5. OpenStreetMap (2019)
https://www.openstreetmap.org