SEOmator - SEO website analysis & audit tool
Curatedseotools.com - Curated directory of the best SEO tools.
Seolyzer - Seolyzer is the ultimate SEO tool that provides you with all the information you need to improve your website’s health and performance.
OnCrawl - OnCrawl is a SEO crawler and log analyzer that helps you improve your SEO performance. Increase traffic, rankings & revenues. Start your 14-day free trial.
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.
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.