Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Seobility - Seobility allows you to quickly audit and review a website from an onsite SEO perspective.
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.
SEO Crawler - A web-based crawler with real-time crawl feedback.
Cleverstat Backlinks Checker - CleverStat Free Backlink Checker provides accurate and up to date information about backlinks including URL, anchor text, trust rank, number and quality of links.
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.