AWBot is an easy to use tool to test a web site.:
AWbot connects to your web site and make URL requests like any other visitors.
AWBot is not a web indexing robot but a web client tool that emulate some visitors browsing on your site to test its reliab
JLinkCheck is an Ant Task written in Java for checking links in websites. It is not just checking one single page, but crawling a whole site like a spider, generating a report in XML and (X)HTML. JReptator will be its succesor with many more features
Like social boomarking, allows users to share their bookmarks online. Like wiki, anyone can freely edit links. Export / Import boomarks with your browser. Many other features: RSS and Atom feeds, URL check, popular categories, XLIink, ...
aWebVisit analyses web logfiles for visit information like: entry/transit/exit points, internal links followed, length of visit and time spent.
aWebVisit-Map then allows you to examine the links followed by your visitors to and from each web page...
Monitoring tool with support to Websites, RSS, Webservices and Databases. Has notifications by email and RSS and you can access metrics like availability, latency and load time by a web-based GUI. Runs standalone with an embedded HTTP server.