Lighthouse : Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authenti...
Selenium : Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testin...
webhint : webhint is a linting tool that will help you with your site's accessibility, speed, security and more, by checking your code for best practices and co...
Diagnostic.css : Diagnostic.css is a stylesheet which allows the user to test for common errors in a page's markup.
Also : https://github.com/karlgroves/diagnostic.css
Browsershots : Browsershots makes screenshots of your web design in different operating systems and browsers. It is a free open-source online web application providi...
an accessibility visualization toolkit that aims to reduce the friction of a11y testing
