SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Mobile First Index Checker - mobile first indexing, mfi, seo, mobile, google
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Curatedseotools.com - Curated directory of the best SEO tools.
Serpstat Website SEO Checker - Check your website's SEO, analyze competitors and keywords
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.