Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Curatedseotools.com - Curated directory of the best SEO tools.
Serpstat Website SEO Checker - Check your website's SEO, analyze competitors and keywords
Screpy - Screpy is a web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).