Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
Dr. Link Check - Broken link checker with malware and parked domain detection
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
LinkChecker - LinkChecker is a free, GPL licensed website validator.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
A1 Website Analyzer - Analyze websites and save data into XML, CSV etc. Extract data about internal linking and importance calculations, file sizes, download times, HTML validation errors etc. across entire websites.