Like any responsible developer, I\'d like to make sure that the sites I produce are accessible to the widest possible audience, and that includes the significant fraction of
Here's an article that has some guidelines for optimizing UI for color blind users:
Particletree » Be Kind to the Color Blind
It contains a link to another article with the kind of tools you were asking for:
10 colour contrast checking tools to improve the accessibility of your design | 456 Berea Street