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BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
LinkChecker - LinkChecker is a free, GPL licensed website validator.
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.
DRKSpiderJava - DRKSpider is an open source website crawler (sitemap generator) and link checker. Features:
Fast Link Checker - An advanced tool to find broken links on web sites.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.