Computerized Simulation of Colour Blindness  
   What do colour-blind people see? Interactive Java applets to demonstrate colour appearance.
   http://tsi.enst.fr/~brettel/colourblindness.html

Color Matters  
   Explores the physiological and psychological effects of color and how it affects appetite, vision, sexuality, energy conservation and its relationship to architecture and interior design.
   http://www.colormatters.com/

Color after images  
   Wayne State University psychology page on color after images.
   http://www.science.wayne.edu/~wpoff/cor/sen/viscolor.html

Color Psychology  
   Color reaction, test, chromotherapy, color and environment and research.
   http://www.shibuya.com/garden/colorpsycho.html

The Psychology of Color and Sound  
   Teachers.Net Lesson Exchange for public school teachers.
   http://teachers.net/lessons/posts/201.html

Matrix Color  
   Research company hosts this site, which explains the physics and psychology of color.
   http://www.matrixcolor.com/

All About Color  
   Articles about use of color and the psychology of color from Pantone.
   http://www.pantone.com/products/products.asp?idArea=16

Natural Color System  
   Color communication in architecture, design, manufacturing, marketing, research and education. This international color order system is entirely based on how the human being perceives color.
   http://www.ncscolor.com/

The Colour Group of Great Britain  
   An interdisciplinary society for those concerned with colour measurement, reproduction vision, and perception, with colour in lighting, architecture and art.
   http://www.city.ac.uk/colourgroup/index.html

Color Codes  
   Book on the modern theories of color in philosophy, painting and architecture, literature, music, and psychology.
   http://www.dartmouth.edu/acad-inst/upne/0-87451-671-4.html

ColorSpeak  
   User-generated interactive database of color meaning and symbology.
   http://bulltown.com/colorspeak/1/