HTML/XHTML Markup Validator" by W3C is a software tool used to validate HTML and XHTML code. It is a stand-alone version of the W3C tool, designed to assist in ensuring web content meets industry standards.
One of the best things about Validator S.A.C. is that it is a normal Mac OS X application that can validate local files, as well as pages on local web sites. You can use either the stand-alone Favelet, drag and drop files and URLs onto the application icon or just go to File > Open, whichever is more convenient for you. The best part? You can validate your markup anywhere, even if you're offline. You can use it on an airplane or in the subway - no network needed.
All in all, Validator S.A.C. is a reliable tool that gets the job done without any fuss. It is easy-to-use, simple to install and perfect for those times when you need to validate your markup on the go. Give it a try today and see how much simpler validating your HTML/XHTML markup can be!
Version 0.6.4: N/A