SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
SEO Site Checkup - Find comprehensive search engine optimization (SEO) tools for your site.
SEOmator - SEO website analysis & audit tool
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
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.
SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.