Google Mobile Test: https://search.google.com/test/mobile-friendly

Google Speed Test: https://developers.google.com/speed/pagespeed/insights/

Structured Data Testing Tool (Sunset): https://search.google.com/structured-data/testing-tool/

Google Rich Results Test: https://search.google.com/test/rich-results

Google Structured Data Markup Helper: https://www.google.com/webmasters/markup-helper/u/0/

Sucuri Site Check: https://sitecheck.sucuri.net/

Built With: https://builtwith.com/

Search Engine Market Share: https://gs.statcounter.com/search-engine-market-share

Industry-leading accuracy for image understanding: https://cloud.google.com/vision

Google-My-Business changes timeline: https://searchengineland.com/library/google/google-google-my-business

Address verification: https://www.edq.com/free-address-lookup-tool/

USPS tool: https://tools.usps.com/zip-code-lookup.htm?byaddress

Keyword Sheeter: https://keywordsheeter.com/

Answer the public: https://answerthepublic.com/

Zoho Support Plans: https://www.zoho.com/crm/resources/support-plans.html

Your Digital Marketing Tool Box: https://www.thinkwithgoogle.com/tools/

KML File maker and GeoSiteMap.xml: https://www.geositemapgenerator.com/generate

Google My Business Categories by Blumenthal: https://blumenthals.com/google-lbc-categories/

Screaming Frog SEO Spider: https://www.screamingfrog.co.uk/seo-spider/

TopVisor Keyword tool: https://topvisor.com

Moz Link Explorer: https://moz.com/link-explorer

Majestic Site Explorer: https://majestic.com/reports/site-explorer

Ahrefs Backlink Checker: https://ahrefs.com/backlink-checker

Bright Local Local Search Checker: https://www.brightlocal.com/local-search-results-checker/