LinkScan is the industrial strength link checking and website management tool. It also does HTML validation and creates two types of publication quality SiteMaps. LinkScan is offered in two versions: LinkScan Workstation is a single-user implementation designed for individual content developers in large enterprises, and for organizations having smaller websites with up to 300 documents, and LinkScan Server is the complete multi-user, enterprise LinkScan implementation including LinkScan/Dispatch and handles extremely large websites comprising up to or more than 250,000 HTML documents and/or 100,000 external links.

This perl script can be used to check the validity of all links in a given html document. It will check image and object tags as well as document links.

WebTester is a handy site management tool, the primary purpose of which is to check your site for broken links. It will report both on missing files and on those which exist but aren't referenced. It can also check the validity of your external links. (That way, if someone moves or removes a page to which you've linked, you'll know that the link needs to be updated!) The script is fairly robust; in addition to following "straight" links, it will also parse and follow links in image maps, in text embedded via SSIs, and in CGI-generated pages. It will let you know the effective "download" file size of your pages, and will provide estimates of how long they'll take to download at various connection speeds. Finally, it can create for you a simple "site map" showing, in outline format, all of your site's pages. (The site map can be included via SSIs on other pages.)