Dr. Link Check - Broken link checker with malware and parked domain detection
Integrity - Feature comparison of link checkers for Mac: Integrity, Integrity Plus and Scrutiny
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...