Panguin Tool by Barracuda Digital - See your website's Google organic visit data overlaid with Google's major algorithm updates and changes to easily identify the impact on your website. Technology by Barracuda Digital.
Whatsmyserp - Powerful Rank & Serp Tracking. Completely Free.
Check My Links - Highlights broken links on page
SendView - The best way to track your competitors' email marketing.
SEOmator - SEO website analysis & audit tool
Seolyzer - Seolyzer is the ultimate SEO tool that provides you with all the information you need to improve your website’s health and performance.