A. Jones

Version 1.7
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This plugin is a very simple plugin the allows you to change the number of words that are displayed in excerpts and to replace the elipsis with text.
The settings for this plugin can be found on the Settings Menu in the Admin Panel. Check the box for the option you wish to manage and enter the value. There are two options: “Maximum number of words to display in an excerpt” and “Read More Text”. You should not use this plugin with other plugins that modify excerpts.
<h3>Arbitrary section</h3>
Need more? Customization is available. Contact sales@shooflysolutions.com for more information.

Simply Excerpts

A simple plugin for exceprts that allows you to change the word count and to replace the elipsis (...) with text. Not compatible with all themes.

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.

Simply Excerpts vs Advanced Post Excerpt