SanityCheck - Get the exact data you need from Google Search Console.
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
Website Speed Ranker - Compare how fast your website loads vs your competitors
Devhints - TL;DR for developer documentation
Dareboost: Website Speed Comparison - Check how fast your website is against your competitors
Meta Tag Generator - Generate HTML code optimal for SEO, social media, & mobile.