Validator S.A.C. (Stand Alone Complex) is a stand-alone, easy to install, version of the W3C's HTML 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 applicaiton icon, or simply use File > Open. Validate on an airplane or in the subway - no network needed.
Validator S.A.C. can also be setup as a Web Service, allowing users to validate over the local network.