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.

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 (optionally) 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.)

Free CGI program that can check all text and picture links on your entire site. With this free script you can open your own link checking service for your site visitors.

This program allows you to set up a link exchange page with the minimum of effort, as you trade links with other sites. It can be configured to accept all links or to only accept pages that contain a reciprocal link. The list can be displayed randomly or in order of sign-up. You can run a return link check at any time which flags and removes all non corresponding sites. The web based admin area lets you remove and update links.

RLHC is a useful tool that performs reciprocal links checking automatically. Simply tell it where the remote web pages you wish to monitor are and the URL of your links. It will then crawl the remote web pages and feedback to you the latest status. You may activate the checking as needed or setup crontab to carry out the checking once a week or so. RLHC can also be used to check if your website has been hacked.