SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Free SEO Checker by Spotibo - An SEO checker that analyses based on Google's algorithm 👀
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Curatedseotools.com - Curated directory of the best SEO tools.