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LinkChecker - LinkChecker is a free, GPL licensed website validator.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Dead Link Checker - Check for broken links on any website
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.