Xenu's Link Sleuth
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Xenu, or Xenu's Link Sleuth, is a computer program that checks websites for broken hyperlinks on Microsoft Windows. It is written by Tilman Hausherr and is available at no charge.
Link verification is performed on "normal" links, images, frames, plug-ins, backgrounds, local image maps, style sheets, scripts and Java applets. Xenu displays a continuously updated list of URLs which can be sorted according to different criteria.
The program is named after Xenu the Galactic Emperor from Scientology mythology.