Web Accessibility: Color and Typography

Accessibility Color Wheel Version 1.0 by Giacomo Mazzocato. When you hover over the color wheel, you’ll see text in colors for normal, Deuteranopia, Protanopia and Tritanopia color vision simultaneously. An "OK" message is displayed when you hover over an accessible color. By clicking on the color, you can copy the hex values. The tool may be used for foreground and background color contrasts. You may download the javascript if you want to use it offline.
British Telecommunications (BT) Age & Disability Action: "Safe web colours for colour-deficient vision" Information and design tools for designing sites so that color cues are not lost.
Color Laboratory The color laboratory allows you to select colors and see how they appear next to one another and in various foreground / background combinations. It also allows you to see those colors as they might appear to color-blind users.
Colour Vision Easy to use tool to quickly see color deficiencies with color palettes for Protanomaly (low red), Protanopia (no red), Deuteranomaly (low green), Deutanopia (no green), Tritanomaly (low blue), Tritanopia (no blue), Typical Monochromatic, ATypical Monochromatic.
Color Contrast Analyzer: The "Colour contrast analyser allows you to check the contrast of two colours using the W3C’s colour contrast algorithm by specifying the colours directly."
"Computer Color Matters -Is your computer color blind?" from Color Matters® Computers
Design Evaluation provides three ways to see what your Web site’s colors look like to the color-blind.
Fonts excellent resource for information about fonts from Webaim
Newman Color Blind Design Evaluation. You can test pages at this site.
Lighthouse International: Effective Color Contrast - Designing for People with Partial Sight and Color Deficiencies offers color guidelines for the Web.
Lighthouse International: Making Text Legible - Designing for People with Partial Sight offers basic guidelines for making effective legibility choices that work for nearly everyone.
Understanding web typography – an introduction an article by Jim Byrne
Vischeck Test your Web design for how it looks to various color blind impairments. Run Vischeck on your own image files or run Vischeck on a Web page: on your desktop or online.
Visibone Information about colour blindness, with colour cards simulating colour spectrums as they appear to those with colour deficient vision.
Website Tips: Color provides several web-safe color charts by VisiBone’s Bob Stein, by Lynda Weinman, and Daxassist. There are also resources to many more charts, and articles and tips on color and design, color psychology and meanings.
Wellstyled Web-Safe Colors Tool incredibly helpful online color scheme tool to help select eye-stopping color schemes.