Nocturne is a new free application from the creator of Quicksilver. It’s a very simple application for switching your computer to “night vision” mode.

Of course, you can already do something similar to this on your Mac just by hitting “ctrl-opt-cmd-8” (Go ahead, try it…it’s fun.)

But Nocturne offers some subtle improvements that make this worth the download.

• Proper color correction in monochrome modes – you don’t lose all your blues or reds when you tint the screen.

• Window shadow toggling – if glowing windows aren’t your thing.

• Background removal – hide the desktop picture so you don’t see a inverted version.

You can download Nocturne here.