SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.

Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.

Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.

SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.

StatCounter - StatCounter is a simple but powerful real-time web analytics service that helps you track, analyse and understand your visitors so you can make good decisions to become more successful online.

SEOmator - SEO website analysis & audit tool