Bernhard Jenny and Nathaniel Vaughn announced the availability of Color Oracle
(http://colororacle.cartography.ch/) for Mac OS 10.3.9 and above (freeware). Links are provided at the site for Windows compatable tools too.
Color Oracle takes the guesswork out of designing for color blindness by
showing you in real time how people with common color vision deficiencies
will see your maps and graphics. Color Oracle applies a full screen color
filter to art you are designing ˆ independently of the software that you
are using.
Seeing is believing! Instantaneously identify and correct problem colors
in your art using Color Oracle’s system-wide menu and keyboard shortcuts
accessible in any program.