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RLC is a useful tool that performs reciprocal links checking automatically. You may activate the checking as needed or setup crontab to carry out the checking once a week or so.
Price: $49.95

The Link Checker script is used to verify that your link exists on other sites (listed in linkchecker.dat). Link Checker can be run from the browser, or automatically via cron. Results are logged to linkchecker.log.
Price: $15.00

Widexl designed this link popularity tool to help webmaster finding out who are linking to their sites. Many search engines today are ranking web sites by the number of sites linking to them. Link Popularity is also important for a high keyword search engines page ranking. Offer this script online for your visitors.
Price: $49.95

Link Restrictor is an easy to use web based tool that automatically and systematically checks to see that your hard earned dollars spent on advertising banners and hyperlinks are not wasted. Link Restrictor's job is to see that your well crafted, banner ads and hyperlinks are actually being displayed by your link partners.
Price: $39.99

LinkChecker is a web-master's dream come true. It not only takes in a list of links and tells you which ones are bad links, but it gets so specific as to tell you which ones redirect to other pages, which are forbidden access links, which are successful, and which are the old 'File Not Found' pages.
Price: Free for Members/$100

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.)
Price: Freeware

Link Master will completely automate your link exchange program. Webmasters will be able to add a link to your website once a reciprocal link is placed on their website. Your links page can be spidered by the search engines and require the reciprocal link to also be spidered by search engines. Optional admin notification for each new link added and complete administration panel. Templates are included with the software and you have complete control over the look and feel your links pages as well as the ability to modify the data collected.
Price: $24.95