1. Colors by HUE
http://www.lynda.com/hexh.html

2. Website Tips for Color
http://www.websitetips.com/color/

3. Set color Preferences for your websiste:
http://www.sentex.net/%7Emmcadams/colorcube/

4. Color Toy:
http://www.defencemechanism.com/color/color_toy_fr.htm