Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
LinkChecker - LinkChecker is a free, GPL licensed website validator.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Integrity - Feature comparison of link checkers for Mac: Integrity, Integrity Plus and Scrutiny
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.