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chklinks is a non-threaded Perl link checker. It helps finding broken links on your website. It does not raises many simultaneously connections for its job, run out of the resources and crash your system in a moment.
LCat is a php/mysql cataloging system for hyperlinks, intended for use on websites. It is build around a set of objects providing the basic functionality and complemented with a set of scripts and templates to perform communication with the user.