Site Valet : Web Tools for Quality, Accessibility, Standards Compliance.
The PHP Coding Standards Fixer : The PHP Coding Standards Fixer tool fixes most issues in your code when you want to follow the PHP coding standards as defined in the PSR-1 and PSR-2 ...
When can I use... : Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.
W3C mobileOK Checker : This checker performs various tests on a Web Page to determine its level of mobile-friendliness.
PHP_CodeSniffer : PHP_CodeSniffer tokenises PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.
