Redhulk50
You can find it in every Oculus device's Store, Oculus PC (Mac?) and SteamVR.
It's not free and if unsure which one to get you may always ask which one is best for your usage habits 🙂
Buying it on one platform doesn't give you access to every version. There are alternatives being made also. But I don't know them off the top of my head.
Or you could go to their homepage. https://www.vrdesktop.net/