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This tool will create 10 shades of the base color, at varying degrees of opacity. The top row emulates opacity over a white background, the bottom over black. The opacity values are 100% opaque, 75%, 50%, 25% and 10% on the top row. The bottom row begins at 85% rather than 100% and continues on as the first.
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This one is really interesting. Here you can find book covers by its colour. Simply enter a hex value in the search field and hit enter and you get: Lots of books with covers in your selected colour. Really good if you are looking for some new graphical inspiration 
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The Color Contrast Visualiser allows you to visualise good colour combinations on a Photoshop style colour picker. It’s primary use is finding acceptable colours from an existing inaccessible combination - while maintaining the aesthetic appeal of the original.
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“Sick of having to open up Photoshop, or another graphics program just so you can get a Hex value? ColourMod for Konfabulator brings ease and simplicity to colour picking on Windows and the Mac.” Sounds good to me!
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At colorhunter.com you can create and find color palettes made from images.
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A great recource to find web-safe, web-smart and unsafe colors for your website.
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The Positively Polychromatic Palette
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Color Tool
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Fiki: Simple to the bone yet I’ve been looking for it for years Simple is always better
crazyleaf: Thank you both for your appreciation, and thank you Thomas for the opportunity. Definitely Thomas you should listen...
Orion12: Heyall… Glad to see ‘the site’ coming soo far, so fast..(seems fast to me, regardless of any...
Patty S: Waaaaayaaaallll it’s hard to pick just one because they’re all great! I must admit that I’ve never...
A u d e e: I’ve enjoyed so much reading this interview Thomas. It was a surprise for me to know that Alex is a dentist :)...
Desfrenes: Hello ! I’ve created a simple class to generate Taconite response with the JQuery Taconite plugin :...
Jonathan: I’ve used Google Analytics for quite a while now, but I think its time has come… I just installed Woopra...