Seolyzer - Seolyzer is the ultimate SEO tool that provides you with all the information you need to improve your website’s health and performance.
SEOmator - SEO website analysis & audit tool
Internet Marketing Ninjas - Internet Marketing Ninjas provides an SEO tool that offers extensive information related to your site’s health and well-being.
Whatsmyserp - Powerful Rank & Serp Tracking. Completely Free.
SEO Minion - Chrome extension & Firefox add-on to help you with SEO
SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.