Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Scrutiny - Scrutiny for Mac helps you manage and improve any number of websites. Link check, search, full website spell check, XML sitemap generator, SEO audit
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.