superann

This plugin filters the sitewide comments feed as well as individual post comment feeds.
Upon first-time installation and activation, all trackbacks will be removed from the default WordPress comments feeds. 
You can override this behavior on the options page and also use the comments or trackbacks only feeds described below.
URL for comments only feeds: add the variable “comments” to your feed query string.
<ul>
<li>http://mysite.com/comments/feed/?comments</li>
<li>http://mysite.com/?feed=rss2&withcomments=1&comments</li>
</ul>
URL for trackbacks only feeds: add the variable “trackbacks” to your feed query string.
<ul>
<li>http://mysite.com/comments/feed/?trackbacks</li>
<li>http://mysite.com/?feed=rss2&withcomments=1&trackbacks</li>
</ul>

Separate Feed Comments and Trackbacks

Remove trackbacks from your sitewide and individual post comment feeds, and/or have alternate feeds for comments or trackbacks only.

chrisguitarguy

agencypmg

Hate Pingbacks and Trackbacks? Me too. Pingback Killer disables of of WordPress’ built in pingback functionality.
This is a very simple plugin that… 
1. Removes the <code>X-Pingback</code> header WordPress sends 
2. Causes any <code>bloginfo('ping_backurl')</code> call to return an empty string 
3. Hijacks the two options relating to pingbacks 
4. Removes the /trackback/ rewrite rules
There are no options pages, it just works.
Bugs? Problems? <a href="http://pmg.co/contact" rel="nofollow ugc">Get in touch</a>.

Pingback Killer

Pingback Killer disables all of WordPress' pingback functionality.

Separate Feed Comments and Trackbacks vs Pingback Killer