Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
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
FandangoSEO - Monitor your SEO 24/7 with our SEO Crawler and Log Analyzer
LinkChecker - LinkChecker is a free, GPL licensed website validator.