0 to 255 – a simple tool that helps web designers find lighter and darker colors based on any color
Big Color Database
Check My Colors – Analyse the color contrast of your web pages
Color Wheel Pro
Complete HTML True Color Chart – Web safe colors
Secrets of Web Color Theory
Super Color Chart – Generates colored background and colored links across several platforms. You can enter your own background image too.
Web Safe Colorizer – Click a web-safe background and see how it looks with all the web-safe colors as foregrounds.
Web Colors – HTML color names.
Web Safe Color Sampler – Click on a color to see the neighborhood of web safe colors close to it
COLOR SCHEMERS & TOOLS
Artima Color Schemer
Color Match 5K
Color Mixers – Very very cool
Color Cop – eyedropper, magnifier, color scheme
Color Picker – after you select a color, matching images pop up
Color Scheme Designer
COLOURlovers – COLOURlovers is a creative community where people from around the world create and share colors, palettes and patterns, discuss the latest trends and explore colorful articles… All in the spirit of love.
HTML Color Chart
I Like Your Colors
More Crayons – color cube
Web-safe Colorizer RichInStyle.com
The Color Schemer
Webmasters Color Library – See what your color combinations look like before you use them