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
grocy : grocy is a web-based self-hosted groceries & household management solution for your home.
Mink : Mink is an open source acceptance test framework for web applications, written in PHP 5.3.
tota11y : an accessibility visualization toolkit that aims to reduce the friction of a11y testing
Monitor the accessibility of your websites with pa11y-dashboard, and protect against accessibility errors creeping into your codebase.