TunnelVision is described as 'Allows you to hide the parts of the screen where your mouse cursor is not, effectively increasing privacy (though at a cost)' and is an app in the security & privacy category. There are three alternatives to TunnelVision for Windows, Google Chrome, Mozilla Firefox and Mac. The best TunnelVision alternative is Cinemadrape, which is free. Other great apps like TunnelVision are LeDimmer and Hide My Screen.
CinemaDrape helps you focus on your current task on the screen (such as a video in a web page, a photo or a document editor area) by instantly blanking or dimming the other less important areas in a web page or in the background windows.
LeDimmer is a small Windows application (<200KB) that sits in the system tray and simply dims the screen around the foreground window.
Hide My Screen hides the contents of your screen while still allowing you to navigate around and interact with your apps.
