Natural Locomotion (NaLo) allows you to walk and run in virtual reality games using feet trackers.

This app allows using your smartphone as:
- Foot tracker (with other smartphone on the other foot)
- Foot tracker (with a Nintendo Switch Joycon on the other foot)
- Foot tracker (with a PSMove controller of PS3 on the other foot)
- Body tracker in the pocket (To improve movement direction, especially with Joy-Con).

Natural Locomotion is available on Steam for HTC Vive, Oculus Rift and Windows Mixed Reality headsets: http://store.steampowered.com/app/798810/Natural_Locomotion/