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