Monitor Backlinks - Easy Link Management - SEO Tool for automatically checking your backlinks.
Dr. Link Check - Broken link checker with malware and parked domain detection
Botify - Traffic Managers, SEO Managers, Webmasters:Crawl your site to extract all of its metadata and identify areas for improvement
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
LinkChecker - LinkChecker is a free, GPL licensed website validator.