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BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
accessiBe - Making websites accessible to people with disabilities
Dead Link Checker - Check for broken links on any website
Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...