TrailGen was a GovHack 2017 project made by the team from Whangarei, New Zealand.
TrailGen is an app that makes it easier to get out and get active.
You enter how much time you have free and then from your location it will provide you with a walk that will have you back in time (taking into account the drive time and your walking speed). For safety it keeps an eye on the daylight left and lets you know if you need to turn around or if you need to take a torch because it will be getting dark before you complete the walk.
An alternative way the application works is to find you a walk that will burn off a specific amount of food or calories. Two burgers for lunch? Need to lose one of them?