
Need to find the perfect color combination for your project? colorcombos.com will help web developers quickly select and test website color combinations. The heart of the site is the Combo Tester, which allows web developers to see how different color combinations work together on the screen.
The colorcombos.com library contains hundreds of color swatches, along with their color hex values.
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When you need to categorize your color choice especially when you are blind to color, this thing could be a really big problem to you. Thanks to this tool, because now you can assign a certain color to a main hue using color sliders to know the color name instantly just by entering RGB (Red-Green-Blue) values, HSB (Hue-Saturation-Brightness) numbers or a hexadecimal code for a color.
This tool could be quite handy because the list of colors comprises 1640 different color names extracted from several sources on the web. Try it now!

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.

This page shows color chips generated at regular intervals and defined by the six-digit hexadecimal representation of color of the form #RRGGBB, where RR, GG, and BB are the hexadecimal values for the red, green, and blue values of the color.

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 
Here you will find over 1500 different color palettes that were extrapolated from Sartorialist clothing pictures. Really great color resource which is updated daily.
This is a nice color scheme tool: You enter a word or phrase and it grabs 5 related images from Yahoo Images, and get the 6 most prominent colors from each.
Here you can create your own color scheme from your images. It is a re-scheming technology based on how the eye perceives color.
Last Comments
Man Mohan Singh: nice finding
Ryan: Good list indeed, but you should update this blog with the screenthumbs.com service which is the most fully featured...
Sebastien: Hi, just to let you know that an another cool tool is WoozTalk (http://www.wooztalk.com). You install an instant...
Will: Kewl…. Thx man.
A Webb: This looks very similiar to http://vectips.com/
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Antonio: Thomas, thanks for having me.