Spot Color is a wrapper around the built-in Mac OS X color picker so you can use it as a stand alone app
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Latest commit b461b18 May 23, 2014 @0xced Merge pull request #1 from paxos/master
Update build settings for 10.9

README

Spot Color is simple mac app to turn the built-in color picker into a stand alone app. Just loads the color panel and configures the window. Other approaches involve creating an AppleScript to open the color picker, but they all seemed really slow.