PageSpeed Ninja - One-click page speed boost for WordPress
Textalyzer - Analyze text readability and SEO parameters
Website Speed Ranker - Compare how fast your website loads vs your competitors
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Website Grader - Grade your website's strengths and weaknesses in seconds.
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.