These tools crawl websites to find "broken" hyperlinks that point to non-existent pages etc.
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2bone Link Checker
in 2 toolboxes
add to my toolboxFree Online Link Checker
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Text Link Checker Tool
in 2 toolboxes
add to my toolboxLink Exchange tool; doesn't check for broken links - rather looks at outgoing links and flags those that may be questionable from a taste or spam point of view.
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Web Developer Extension
in 37 toolboxes
add to my toolboxThe Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock, Mozilla and Seamonkey, and will run on any platform that these browsers support including Windows, Mac and Linux.
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Dead-Links.com
in 3 toolboxes
add to my toolboxFree link-checker limited to 25 pages per domain and 150 external documents. Higher limits if site has a link to Dead-Links.com.
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W3C Link Checker
in 1 toolbox
add to my toolboxAccepts URLs to check for broken links
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Xenus Link Sleuth
in 7 toolboxes
add to my toolboxFind broken links on web sites
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LinkTiger
in 1 toolbox
add to my toolboxLinkTiger is a free online broken link validation service.