Mac OS X only: The makers of our beloved Quicksilver released another interesting utility called Nocturne, which inverts your Mac's screen colors (turns white to black). Mac guy Merlin Mann explains:

For years, you've been able to do something similar by hitting "Ctrl+Opt+Cmd-8," which invokes "Switch to black-on-white" in Universal Access options (go ahead and try it, then hit it again to return to normal). While A1c0r's improvements on this may seem subtle, they're very useful for allowing you to tweak your own preferences and minimizing distracting, full-color solarization effects.


I couldn't take a screenshot of Nocturne in action, but the crappy cameraphone thumbnail to the right will give you an idea of what it looks like. Hit up the Nocturne Preferences pane to toggle Monochrome mode, disable shadows or hide the desktop image, too. Like Merlin said, Nocturne could come in especially handy when you're computing outdoors on a bright day. Nocturne is a free download, Mac OS X only. Thanks, Nick!

Nocturne: Free "night vision" app from the maker of Quicksilver [43 Folders]