Masquerade

Mask, hide and cover parts of your desktop, so to only see a certain area while the rest is hidden to your eyes. Use Masquerade App to mask parts on your screen for better focus or any other reason - hide away all clutter you don't want to see. - Freely resizable mask - Adjustable mask transparency and color - Hides everything after mouse is unused - No Ads or anything, just does what it says - Supports OS X 10.7 +