The makers of WebLight and Tart - software for pragmatic web developers.
The W3C now maintains a binary distribution of the css-validator so we know longer distribute it.
Illumit does distribute end user software that validates CSS, Tart and WebLight.
Tart is a stand alone test and repair tool that lets web developers validate CSS, (X)HTML, Atom and RSS feeds, then categorize, filter and fix problems in a single window, even offline.
WebLight is a web crawler that finds css, markup & link bugs plus it lets you efficiently maintain large sitemaps.
Contact us if you have any questions.