W3schools
Free html xhtml css javascript jquery xml dom xsl xslt rss ajax asp .net php sql tutorials, references, examples for web building.
http://www.w3schools.com/tags/ref_colorpicker.asp
Colortools
Mix color values to find just the right color with this tool.
http://www.colortools.net/color_mixer.html
Pagetutor
Award winning html and javascript tutorials. you'll find easy to learn material on html, tables, forms, frames, javascript, style sheets and a whole lot more.
http://www.pagetutor.com/colorpicker/index.html
Colorpicker
Colorpicker.com - quick online color picker tool | html color codes - colour codes - hex colour - color chart - color schemes - colores codigo - code de couleur - farbcodes - renk kodlari - カラーコード - اللون - 颜色 - 顏色 - цвет - farbe
http://www.colorpicker.com
Colorschemer
Generate matching color schemes like never before!
http://www.colorschemer.com/online.html
Handig javascript om kleur te kiezen
Html special characters by gifart.com!
http://www.gifart.com/color-codes.shtml
Html Color Codes
Get html color codes for your website. color chart, color picker and color palettes.
http://html-color-codes.info
HTML-color-codes.com
Chart of 216 web-safe colors with hex html codes, fitting on one screen. free swatch libraries and color scheme design lab. printed html color charts available.
http://html-color-codes.com/