Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
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.
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
SEO Crawler - A web-based crawler with real-time crawl feedback.
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.