To eject a disc from an Xbox One manually, you'll need to find your console's manual eject button. It's usually located near the normal eject button.

There are several ways to turn off a PS4 controller, including holding the PS button for a few moments, using the Quick Menu, ...

Update: As of early November 2016, the Oculus Rift's minimum PC requirement specifications have been lowered. The recent change is reflected in the chart below.