sitebot.ai - The easiest way to monitor that your website is working as it should. Sitebot uses a real browser to test your site and login automatically.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
DiffHub - Automated Web UI & Functional Testing for non Engineers
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Ghost Inspector - Easily create automated browser tests for your websites and web apps. Ensure everything works and looks the way it should. No coding required. 14 day free trial!
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.