Google Lighthouse - Lighthouse is an open-source, automated tool for improving the quality of web pages.
SiteCheckerTool.com - Website Analytics & Tools
PageSpeed Insights - PageSpeed is addon for ...
A1 Website Analyzer - Analyze websites and save data into XML, CSV etc. Extract data about internal linking and importance calculations, file sizes, download times, HTML validation errors etc. across entire websites.
SiteAuditTool.com - Generate Website Audit Reports
DareBoost - DareBoost is an online tool to test, analyze and monitor your website: speed, SEO, quality, security. All you need for website optimization in a single service.