Website Grader - Grade your website's strengths and weaknesses in seconds.
Smaller - Make your websites load faster
Textalyzer - Analyze text readability and SEO parameters
PageSpeed Ninja - One-click page speed boost for WordPress
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).
SanityCheck - Get the exact data you need from Google Search Console.