Mobile First Index Checker - mobile first indexing, mfi, seo, mobile, google
Textalyzer - Analyze text readability and SEO parameters
Curatedseotools.com - Curated directory of the best SEO tools.
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Site Audit by Ahrefs - Cloud based website analysis for 100+ SEO issues
Website Speed Ranker - Compare how fast your website loads vs your competitors