OVRdrop is a utility application that is used by SteamVR in order to mirror the monitor, a webcam, or a desktop window into a cross game SteamVR overlay. This app was developed and published by Nicholas Ewalt on April 1st, 2017.
This app should be compatible with all SteamVR headsets that are available on the market, but users should note that tracked controllers are a must-have for most of the features of OVRdrop. While it may be still used with the Oculus Rift and the HTC Vive, certain titles could have some issues with the Rift. One thing that you need to remember is the fact that the Cross Game Overlays always draws on top of the game's geometry. That's because Depth information isn't fed to the Compositor by SteamVR games, but it shouldn't be a problem most of the time.
OVRdrop can clon webcam sources, an entire monitor, and most of the desktop windows into VR, support Side By Side 3D content into VR works with almost all SteamVR compatible games. The overlay can be attached to the screen, one of the controllers, or even to the world with ease, the overlay can also be moved and rotated and scaled, FPS can be configured, Crop Region can be configured as well, and the app has save/load support.