Ahrefs Webmaster Tools - Optimise your website and get more traffic from Google.
Website Grader - Grade your website's strengths and weaknesses in seconds.
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors
Smaller - Make your websites load faster
Treo Site Speed - Find out how fast your website is for real users
Textalyzer - Analyze text readability and SEO parameters