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>
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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.

Stephanie Leary

Creates widgets that display excerpts from posts or pages in the sidebar. You may use ‘more’ links and/or link the widget title to the post or page. Requires <a href="http://blog.ftwr.co.uk/wordpress/page-excerpt/" rel="nofollow ugc">Page Excerpt</a> or <a href="http://www.laptoptips.ca/projects/wordpress-excerpt-editor/" rel="nofollow ugc">Excerpt Editor</a> for page excerpts. Supports <a href="http://robsnotebook.com/the-excerpt-reloaded/" rel="nofollow ugc">the_excerpt Reloaded</a> and <a href="http://sparepencil.com/code/advanced-excerpt/" rel="nofollow ugc">Advanced Excerpt</a>.
Now on <a href="https://github.com/sillybean/Post-and-Page-Excerpt-Widgets" rel="nofollow ugc">GitHub</a>.

Post and Page Excerpt Widgets

Creates widgets that display excerpts from posts or pages in the sidebar.

Simply Excerpts vs Post and Page Excerpt Widgets