SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Topvisor - All in one SEO and PPC tools for better marketing.
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.
Botify - Traffic Managers, SEO Managers, Webmasters:Crawl your site to extract all of its metadata and identify areas for improvement
LinkChecker - LinkChecker is a free, GPL licensed website validator.