Hunter Satterwhite

Add custom RSS feeds to your WordPress installation and customize the feeds using theme templates. Each feed contains a unique slug and can use either a custom theme template or if no template is provided then the feed will use WordPress’ default RSS2 template. Easily keep track of what your feeds do by adding a description to them or testing them out clicking the quick link provied in the “existing feeds” table listing.

Custom RSS Feeds by Envintus, LLC

Add custom RSS feeds to your WordPress installation and customize the feeds using theme templates.

wokamoto

This plugin modifies RSS feeds and ATOM feeds as you want.
<h4>How to use</h4>
Putting the following templates into the current theme folder, then you can use the customized feed templates instead of the default ones.
<ul>
<li>feed-atom.php – Atom Feed Template for displaying Atom Posts feed.</li>
<li>feed-atom-comments.php – Atom Feed Template for displaying Atom Comments feed.</li>
<li>feed-rdf.php – RSS 1 RDF Feed Template for displaying RSS 1 Posts feed.</li>
<li>feed-rss.php – RSS 0.92 Feed Template for displaying RSS 0.92 Posts feed.</li>
<li>feed-rss2.php – RSS2 Feed Template for displaying RSS2 Posts feed.</li>
<li>feed-rss2-comments.php – RSS2 Feed Template for displaying RSS2 Comments feed.</li>
</ul>
Note: 
When these feed templates are not in the current theme folder, WordPress’s default feed templates will be used.

Feed Template Customize

This plugin modifies RSS feeds and ATOM feeds as you want.

Custom RSS Feeds by Envintus, LLC vs Feed Template Customize