If you are testing web based applications, then it is necessary to find the broken links in the website.
Links which is not redirected to proper pages or not showing any output page is known as broken links.
Listed below are the online tools to find broken links in your application
1) http://validator.w3.org/checklink
2) http://htmlhelp.com/tools/valet/
Other than these tools there is one tool called “Xenu” also used to find the broken links. But you have to install it in your local system. Here is the link to download “Xenu”
http://www.softpedia.com/get/Internet/Other-Internet-Related/Xenu-Link-Sleuth.shtml
These tools will not give you all the broken links in your website. Normally manual testing of a application is far better than testing with the help of tools.
If you know more about the tools to find broken links, kindly write down in comments section or send an e-mail to me.