PageSpeed Ninja - One-click page speed boost for WordPress
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Website Speed Ranker - Compare how fast your website loads vs your competitors
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Website Grader - Grade your website's strengths and weaknesses in seconds.
Serpstat Website SEO Checker - Check your website's SEO, analyze competitors and keywords