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...
W3C Link Checker : Check links and anchors in Web pages or full Web sites
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 ...
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
