W3C mobileOK Checker : This checker performs various tests on a Web Page to determine its level of mobile-friendliness.
Site Valet : Web Tools for Quality, Accessibility, Standards Compliance.
Email Standards Project : The Email Standards Project is about working with email client developers and the design community to improve web standards support and accessibility ...
Paged.js : Paged.js is a free and open source JavaScript library that paginates content in the browser to create PDF output from any HTML content. This means you...
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
