<p>To enhance the WordPress default formatter’s flexibility, this plugin<br />
enables configuring content and excerpt styles with various formats.</p>
<h4>Features</h4>
<ul>
<li>Replaces “br” tags with “p” tags.</li>
<li>Produces valid XML parser for all sources.</li>
<li>Automatically generates excerpts in chosen length.<br />Enables configuring following settings; length, separator elements (period,<br />
touten, paragraph), read more text, tags which you allow in excerpts,<br />
and etc..</li>
<li>Add any tags or texts to one’s contents as header and footer.</li>
</ul>
<h4>Demo</h4>
<p>See this plugin working on <a href="http://www.wembley.jp/" rel="nofollow ugc">my blog</a>. Contents and excerpts in this site are generated by this plugin.</p>


Plastic Post Style

記事本文と抜粋の出力を調整・カスタマイズします。Configure content&excerpt styles of all posts with various configurations.

J0SiE

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


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.

Plastic Post Style vs Auto Excerpt everywhere