LinkChecker - LinkChecker is a free, GPL licensed website validator.
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
DRKSpiderJava - DRKSpider is an open source website crawler (sitemap generator) and link checker. Features:
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
SiteAnalyzer - SiteAnalyzer it's a desktop Crawler, designed to SEO audit and analyze website content to identify technical and SEO-optimization errors. After scanning your website, SiteAnalyzer will display all the technical and SEO errors and help to fix them!