Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
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.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
SEO Crawler - A web-based crawler with real-time crawl feedback.
Sitechecker - All-in-one SEO platform including rank tracker, website SEO audit tool and website changes monitoring. Detailed reports by 100+ parameters with how-to-fix guides.