color-scheme-designerColorSchemeDesigner.com is a nice javascript-based website that allows you to quickly and easily design web-safe color palletes with a variety of designs.  Full support for mono, complement, triad, tetrad, analogic, and accents are supported, along with Vision simulations for various types of color-blindness.  Color selections can be previewed with a template light and dark site for a quick sample, and easily exported to RGB schemes, Photoshop ACO palettes, GIMP GPL palettes, and more.

Color Scheme Designer 3.