"OVR Locomotion Effect" is an overlay tool that aims to reduce VR sickness. It displays anti-sickness effect to HMD by controller input. You can use this tool on any SteamVR games since the effect is displayed as an overlay in front of the game.
Some detailed information has moved to Steam Guide page.
User Guide
https://steamcommunity.com/app/1393780/discussions/0/3410928883774809184/
And store page description has updated more simply.
