Website Grader - Grade your website's strengths and weaknesses in seconds.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
PageSpeed Ninja - One-click page speed boost for WordPress
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
WebSite Auditor - The techie's SEO spider: find site issues other tools miss
Pulno - SEO Audit and Website Analysis. Pull up your SEO.