Smaller - Make your websites load faster
PageSpeed Ninja - One-click page speed boost for WordPress
Website Grader - Grade your website's strengths and weaknesses in seconds.
Website Speed Ranker - Compare how fast your website loads vs your competitors
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).
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.