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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.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Colour Blindness Simulator - Use our Colour Blindness Simulator to reveal how your images may appear to users with a variety of...
LinkChecker - LinkChecker is a free, GPL licensed website validator.