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
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...
mobiReady : The mobiReady testing tool evaluates mobile-readiness using industry best practices & standards.
BounCA : BounCA is a tool to manage your personal SSL certificates and authorities in a central and easy to use interfaces. It provides an easy accessible web ...
aXe : Automated tool to find Accessibility defects on your web site by using the aXe Chrome extension. Drop the aXe on your accessibility defects! We believ...
Monitor the accessibility of your websites with pa11y-dashboard, and protect against accessibility errors creeping into your codebase.