ColorExplorer
This is a great site for designers (print or web) who are having color blockage at 2am, like me.
What is Color Explorer?
Simply put, ColorExplorer is an online toolbox for working with color palettes. Being a little more elaborate, the current site is the result of evolvement on my acclaimed ColorMatch 5K project dating back as far as 2001.
With ColorExplorer you can quickly and easily create, manage and evaluate color palettes for use in graphic design, web designs, layouts, and much more.
Highlights:

  • Import colors from photos, images, and artwork! Instantly get a color palette based on your own graphics!
  • Create matching color pallets in a snap! Explore numerous matching algorithms to fit your taste!
  • Interactive virtual color desk! Explore multiple color libraries in true “fan” style!
  • Save and/or print your color palettes as .ase, .aco, .png, or .txt!

Right now the service is free and they are relying on the kindness of strangers. So if you find the site useful, make a donation.