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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.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
tota11y - An accessibility visualization toolkit from Khan Academy
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Accessible Metrics - Digital Governance
Dead Link Checker - Check for broken links on any website