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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.
HarvestMan is a fully functional, multithreaded webcrawler cum offline-browser. It is highly customizable and supports as much as 55 plus options for controlling and customizing offline browsing. It is written entirely in the Python programming language.