Note: this post is from 2007, outbound links may be broken.
ColorJack – Color Scheme Generator
ColorJack Sphere provides an easy way to create color palettes.
You simply select the type of color scheme you’re looking to create (i.e. Six-Tone, Complementary or Triadic) and move the little dots in the color wheel to get the color palette of your liking. You can select a level of color blindness and set the color spectrum (websafe, websmart). You can even export the palettes to Illustrator or Photoshop.
A minuratuarized version of Sphere, ColorJack Sphere Widget is available for all major operating systems.
ColorJack Sphere Widget
There’s also a little DHTML color picker available for download so you can use it in your own website/application.
Visit ColorJack to check out all of these tools.