Brandon Moeller

This plugin allows publishers to better control the width of photos that use the WordPress caption shortcode feature, when that content is displayed in RSS feed readers like Google Reader, as displayed on small-screen mobile devices.
This plugin accomplishes the same thing that adjusting the “function img_caption_shortcode” code in includes/media.php would, but allows the user to automatically update WordPress without worrying about losing these changes.
It is the author’s hope that in future releases of WordPress (post 3.3), this plugin will prove unnecessary if (hard-working, responsive-minded) WordPress core developers decide to include the fix in newer versions of the awesome great open source software we have all come to love.
The code for this plugin was inspired by code found on this page of the codex: 
<a href="https://codex.wordpress.org/Function_Reference/add_filter" rel="nofollow ugc">https://codex.wordpress.org/Function_Reference/add_filter</a>
Read more about RSS Responsive Caption on the author’s website here: 
<a href="http://brandonmoeller.com/blog/2011/12/18/rss-responsive-caption/" rel="nofollow ugc">http://brandonmoeller.com/blog/2011/12/18/rss-responsive-caption/</a>

RSS Responsive Caption

Improves WordPress caption elements so captioned images in RSS feeds responsively adjust to fit within Google Reader’s screen on Android devices.

room34

This plugin is an add-on for Modern Tribe’s The Events Calendar plugin. It modifies the RSS feed output, allowing you to specify a date range (rather than a fixed number of items), and adds the featured image and venue details into the feed.
It was created specifically to fill a need for a more highly customized display of event details in a MailChimp RSS Campaign, but may be of use for other purposes as well! To learn more about the details of the plugin and how to use it with MailChimp, see our blog post on the work that led to the plugin’s creation:
<a href="http://blog.room34.com/archives/5778" rel="nofollow ugc">http://blog.room34.com/archives/5778</a>

RSS Enhancements for The Events Calendar

Customize the RSS feed in Modern Tribe's The Events Calendar plugin with date range, featured image and venue details.

RSS Responsive Caption vs RSS Enhancements for The Events Calendar