Spot Color lets you use the standard Mac OS X color picker as a stand-alone app!
Software Santa LOVES his Copy! A Software Santa Pick! Spot Color is a simple application that allows you to use the standard Mac OS X color picker as a stand-alone app.
Spot Color gives you the possibility to quickly grab colors without having to be in an image editing app like Photoshop.
Since it uses the built-in color picker, you can utilize the system wide color picker plugins and swatches.
http://mac.softpedia.com/get/Utilities/Spot-Color.shtml