I've been using iColors which is a standalone system color picker - http://www.fadingred.com/icolors/ http://www.fadingred.com/icolors/ I use it in conjunction

I've been using iColors which is a standalone system color picker - http://www.fadingred.com/icolors/ http://www.fadingred.com/icolors/ I use it in conjunction with various plugins to said system color picker such as http://wafflesoftware.net/hexpicker/ http://wafflesoftware.net/hexpicker/ and http://lithoglyph.com/mondrianum/ http://lithoglyph.com/mondrianum/. It is very nice that the OS X system color picker supports adding plugins to /Library/ColorPickers because then you have support for new color picker panels in every program that uses the System Color Picker.