Windows: If you'd like to mask your screen to block distractions and help you focus on the important parts of the document or web site you're looking at, Kino is customisable masking tool.
When you run Kino a semi-opaque black mask extends across your screen. Click the Change Area button in the lower left corner to set a custom mask size — in the screenshot above we set the mask to show just the centre column of stories at Lifehacker. Adjust the opacity of the mask with the slider at the bottom of the screen anywhere from total blackout to about 5 per cent grey to provide the level of masking you need.
Kino supports multiple monitors too, in the upper right corner next to the O and X buttons — which minimise and close the application, respectively — is a button with a little pair of numbered monitors on it. Clicking the monitor icon will open a copy of Kino on your other monitors, each one with an independent opacity and mask size.
Kino is freeware, Windows only. Check out more screen masking tools by taking a look at previous reviewed ScreenMask, CinemaDrape and Lifehacker reader-created Universal Darkroom. Have a favourite tool or trick for creating a distraction free virtual space? Let's hear about it in the comments.