Textalyzer - Analyze text readability and SEO parameters
Website Grader - Grade your website's strengths and weaknesses in seconds.
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Smaller - Make your websites load faster
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters