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.

J0SiE

Created to help those people who don’t like to edit code in template files (or are too lazy to do that). 
Just activate the plugin and it will automatically show the_excerpts in your homepage, archives and search results. 
It tries to display your custom excerpt text and if it doesn’t find it it will show an automatically generated excerpt. 
You can also define excerpt length, custom read more link and attach a thumbnail.

Auto Excerpt everywhere

Thanks to author for creating this plugin. 
It's works out of box. And working fine at WordPress Version 4.6.1


Works out of the box on WP Version 4.6.1

The plugin automatically displays excerpts instead of full post contents in your blog. Custom excerpts and generated excerpts supported.

Simply Excerpts vs Auto Excerpt everywhere