This plugin is including the Flattr button in your RSS/Atom feed. There are some more options to extend Flattr functionality like optional autosubmit
Das showRSS-Plugin der CONTENTmanufaktur (http://www.contentmanufaktur.net) zeigt den RSS-Feed einer anderen Webseite an.
Adds a sidebar widget that display OPML, ATOM, RSS feed link for your WordPress blog.
Feed(Aggre)gator merges a group of RSS feeds into a single widgetized list.
Creates an RSS feed for TweetRandom.com.
FeedWrangler is a utility for creating and editing custom feeds.
This plugin adds a small widget within each blog post to share blog posts on Facebook, Twitter, Google Buzz, Digg, Surfpeople, and well over 100 more
This plugin allows you to manage tags with wpomatic.
An add-on to WP-o-Matic that creates a new author for each campaign.
A shortcode to render an RSS feed in a post/page
Show RSS Feed inside a post.
Converts relative links in feeds into absolute links by adding the base of the site from server environment variable.
Notify Unconfirmed Subscribers allows users to notify unconfirmed subscribers from FeedBurner email subscriptions.
With Omnifeed plugin you can display and embed RSS/ATOM feeds in your WordPress posts and pages.
This plug-in adds the post thumbnail of articles to the RSS and Atom-Feed via Media RSS specification.
This plug-in restricts the access to blog and feed. Visitors need to login before accessing the blog. It offers a private feed for every user.
This plug-in redirect reqests to the main or comment feed of the blog to Feedburner or a similar service.
Switches WordPress feeds to default to Atom format and obsoletes the RDF and RSS 0.92 feeds.
Totally in Portuguese-Br yet, this add a very customizabole rss or atom feed. Made after the standard wp rss plugin.
With the yahoo currency plugin you can display a feed of Yahoo Currency Exchange rates.
Caches RSS Feeds for display on your WP sidebar. A list of RSS urls can be entered and the feeds will be aggregated into one list ordered by date.
Add a list of "Subscribe" links to your sidebar. Options include your blog and podcast feed, Twitter page, iTunes, Facebook Fan Page, Google Profiles
Improve the performance of your site by serving your feeds as static (XML) files.
Feedme is a simple and powerful tool that will surely enhance any WordPress install. As feed readers become more advanced and are capable of handling
This plugin allows you to integrate your twitter, and last.fm account into a page, or an article on your blog.
With the gweather plugin you can display and embed Google Weather Feeds in your WordPress posts and pages.
Dynamic blogroll based on RSS/Atom feeds.
A customizable plugin to display photos from an RSS or Atom feed as a widget or shortcode.
Creates 4 feeds : 'trdf' 'trss', 'trss2' and 'tatom' highly customisable using theme template.
Adds some text to your feed items like: "Filed under tag1, tag2, tag3".