aaron44126

This simple plugin disables the automatic parsing of links in comments on your 
blog. Ordinarily, if a user types something like http://www.google.com/, it 
will automatically be turned into a clickable link when it is displayed. This 
plugin disables this behavior for http, ftp, and e-mail links.
Note that comments can include the HTML tags necessary to create links, if you 
allow HTML in comments, and these links will not be removed. This also allows 
you as the administrator to get around the “no comments in links” rule enforced 
by this plugin, since administrators (and editors) by default can post comments 
with unfiltered HTML.

No Comment Links

When activated, disables automatic parsing and creation of clickable links in comments, including http, ftp, and e-mail links.

mastergraphiks

This is the Simple Plugin which required no special access or control, Simple install it and it will remove the URL from your Comments Form!

Disable Comment Url

Nice and simple plugin help you to remove URL from comment to avoid people to do spam comments by posting their urls to your website

No Comment Links vs Disable Comment Url