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Illumit is a very small independent software development company based in Belfair, Washington USA. Since 2002 customers have used sofware developed by Illumit to maintain web sites. In 2002 Illumit released WebLight, an automated web site validator that made regularly testing web sites for broken links and non-standard markup practical. In 2008 Illumit released Tart, the test and repair tool that lets web developers validate CSS, (X)HTML, Atom and RSS feeds, then categorize, filter and repair problems in a single window, even offline.