Window Hider is a straightforward option for hiding/unhiding windows through a key combo.
This little utility is easy-to-use; hit the key combo Alt B to hide the current windows and Alt C to unhide. The key combo will hide the app when it is open on top, but it will work for any other opened-on-top window in order. As of this release, the key combo is limited to what we mentioned above, but the author states that there will be the ability to customize the combo and add command line parameters in a future version.
Window Hider is a useful utility for use when an app keeps hiding a window or when you want to control what window is shown and when.