ht://Check is more than a link checker. It's particularly suitable for checking broken links, anchors and web accessibility barriers, but retrieved data can also be used for Web structure mining. Uses a MySQL backend. Derived from ht://Dig.
RAHoo is a PHP-based, self-documenting, easy to install, fully customizaable web application written in PHP using MySQL and a suitable web server. Use it to keep a directory structure of links similar to Yahoo or the Google search directories but focuse
TopoWeb is about web topology, the linked structure of the web. Harness the power of link awareness, a method not just for surfing hyperlinks backwards to find content, but also, for publishing content.