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Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
Smaller - Make your websites load faster
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Website Grader - Grade your website's strengths and weaknesses in seconds.
Integrity - Feature comparison of link checkers for Mac: Integrity, Integrity Plus and Scrutiny
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.