SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
Matomo - Matomo is an open-source web analytics platform
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
Clicky - Clicky Web Analytics is a simple way to monitor, analyze, and react to your blog or web site's traffic in real time.