Color Standards

International Color Consortium (ICC)
sRGB

General Color Ressources

Color Matters * Colorcell Tip!
EasyRGB
Color F.A.Q. by Charles A. Poynton. * Colorcell Tip!
Color and Color Vision Questions and Answers by Munsell Color Science Laboratory
Color Physics FAQ by Colourware

Color Management

International Color Consortium (ICC)
ColorSync (Apple) + free Color Cookbook (PDF)
Color Management Systems (Adobe)
Windows Color Management (Microsoft)

Color Games & Surveys

FarbCodes (Survey and various ressources, German) * Colorcell Tip!

Color Online Tools

Color Converter (Convert Colors to various Colorsystems)

Color Software Tools

Color Set (Simple Color Picker - WIN)
CIE Chromaticity Diagram (Create CIE Chromaticity Diagrams- WIN)
RGB to HSV (Convert RGB to HSV - WIN)

Color Mathematics

Color Conversion Formulas (E. Vishnevsky)
Color Conversion Formulas (EasyRGB)

Color Products

Pantone (Color Guides / Various Color Products)
Color Cube (Color Cube 3D-Puzzle)
Visi Bone Color Charts (Reference Color Charts)