Who Can Use - WhoCanUse is a tool that brings attention and understanding to how color contrast can affect different people with visual impairments.
Koa11y - Automatically detect accessibility (a11y) issues on webpages
Startup Fame - Discover awesome startups. Add yours in seconds and climb the SEO ranks.
Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
Colour Contrast Analyser - TPGi's ADA Color Contrast Checker checks for helps determine the accessibility the contrast ratio of two colors for WCAG AA and AAA.
Page Speaker - Modern web accessibility tools for agencies & webmasters