Thrunobulax

Description
This plugin was born out of an explicable problem with the standard 
Wordpress RSS widget on my server. Whether a curl problem within 
fetch_feed() or something else, this plugin now uses DOM to load 
the feeds rather than curl. If you’re getting the “An error has 
occurred; the feed is probably down. Try again later.” message (and 
you are sure that your feed is valid (validate with 
feedvalidator.org) try this plugin.
Installation
<ol>
<li>Upload the <code>mob-rss-widget</code>-folder to the <code>/wp-content/plugins/</code> 
directory</li>
<li>Activate the plugin through the ‘Plugins’ menu in WordPress</li>
</ol>
How to Use
Drag and drop the widget into your sidebar in the Widgets menu
Changelog
1.0.0 Release.

MOBy RSS Widget

Description This plugin was born out of an explicable problem with the standard Wordpress RSS widget on my server. Whether a curl problem within fe …

Arno Moonen

This plug-in makes it possible to exclude certain parts of your posts in your feeds. 
It uses the filterhooks <code>the_content</code> (in combination with <code>is_feed()</code>) and <code>the_content_rss</code>.
You have several options to determine what must be excluded; you can hide everything after the More-tag and/or hide everything between <code></code> and <code></code> 
Since update 1.1 you may use multiple CRSS-tags in a post.

CompactRSS

Gives you the possibility to exclude certain parts of your posts automatically from the RSS feed.

MOBy RSS Widget vs CompactRSS