Validator S.A.C. (Stand Alone Complex) is a stand-alone, easy to install, version of the W3C's HTML / XHTML Markup Validator for Mac OS X. Validator S.A.C. is a normal Mac OS X application. No installation is required, just put Validator S.A.C. where you need it (hard drive, flash drive, CD-R, etc). Validator S.A.C. can validate local files, as well as pages on local web sites. Validate using the stand-alone Favelet, drag and drop files and URLs onto the application icon, or simply use File > Open.