SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Dr. Link Check - Broken link checker with malware and parked domain detection
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks