Steve Grunwell

<a href="https://codex.wordpress.org/Excerpt" rel="nofollow ugc">WordPress post excerpts</a> can be a great way to hand-craft the summary of your content. Unfortunately, writing post excerpts isn’t as nice of an experience as what you find elsewhere in WordPress. Want to include links in your excerpts, or bold some text? Hopefully you know some HTML!
Advanced Post Excerpts is designed to change that, by giving your editors an easy, intuitive interface for writing great post excerpts.
For complete details and/or to contribute to ongoing development, please <a href="https://github.com/stevegrunwell/advanced-post-excerpt" rel="nofollow ugc">visit this project on GitHub</a>.

Advanced Post Excerpt

Replace the default Post Excerpt meta box with a superior editing experience.

Jack Reichert

This plugin was developed to display excerpts from random posts in a category. jQuery is used for fading the plugin in and out. It’s a great way for displaying testimonials of clients or just giving a snapshot of content from your site.
Shortcode added as of version 1.4
The most basic use is: <code>[reFader]</code> this will use the default options. 
Here is an example of all the options in use 
 [reFader title=”Random Excerpts” cat=”23″ type=”post” amount=”5″ length=”50″ duration=”5000″ linked=”no” url=”http://www.jackreichert.com/”]
This will show 5 (amount) posts (type) from category #23 (cat). It will show 50 (length) words from each post and fade out/in every 5 seconds (duration). It will not link each title to the corresponding post, but it will link all the titles to this plugins page (url).

Random Excerpts Fader

Creates a widget that takes randomly a number of excerpts from a category of your choice and fades them in and out.

Advanced Post Excerpt vs Random Excerpts Fader