SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Textalyzer - Analyze text readability and SEO parameters
SEO Site Checkup - Find comprehensive search engine optimization (SEO) tools for your site.
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors
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.
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.