Kazuma YAGYU

This plugin changes the WordPress’s native formatting rules to keep the numbers of the line breaks you wrote. 
It adds tags as many as line breaks in posts, comments, or both, even if the line was vacant. 
You can change the settings below in the admin panel. For example: you can choose to add tags for wrapping the paragraphs or not.
<h4>Settings</h4>
You can choose settings below.
<ol>
<li>Choose the target area: in posts, comments, or both(default).</li>
<li>Choose the breaking tag format: (default) or .</li>
<li>Choose the tag which the paragraphs will be wrapped with: tag(default) or none.</li>
<li>Shortcodes that you want to exclude from tag wrapping. 
This doesn’t work if you choose “none” in option #3. 
Default is only “caption” but you can set multiple shortcodes separating “|”. Ex. “caption|map”</li>
</ol>
<h4>Attention</h4>
This plugin doesn’t work with the Visual Editor, so far.
<h4>For Japanese users</h4>
このプラグインは行末に を追加します。 
記事投稿時の改行の数だけ が追加されます。 
段落にタグを追加するか、といったいくつかの設定ができます。 
※ビジュアルリッチエディターではうまく動作しません

Vacant Line BReaker

Wordpress ignores multiple line breaks normaly. This plugin breaks lines as may as you want.

WPKube

FancyThemes

This plugin adds several improvements to WordPress’ default way of creating excerpts.
<ol>
<li>Keeps HTML markup in the excerpt (and you get to choose which tags are included)</li>
<li>Trims the excerpt to a given length using either character count or word count</li>
<li>Only the ‘real’ text is counted (HTML is ignored but kept)</li>
<li>Customizes the excerpt length and the ellipsis character that are used</li>
<li>Completes the last word or sentence in an excerpt (no weird cuts)</li>
<li>Adds a read-more link to the text</li>
<li>Ignores custom excerpts and use the generated one instead</li>
<li>Theme developers can use <code>the_advanced_excerpt()</code> for even more control (see the FAQ)</li>
</ol>
Most of the above features are optional and/or can be customized by the user or theme developer.
Banner image credit – <a href="https://www.flickr.com/photos/chillihead/" rel="nofollow ugc">chillihead</a>
Original plugin author – <a href="https://profiles.wordpress.org/basvd" rel="nofollow ugc">basvd</a>
Useful Resources
<ul>
<li><a href="https://fancythemes.com/what-is-wordpress/" rel="friend nofollow ugc">What is WordPress</a></li>
<li><a href="https://fancythemes.com/wordpress-themes" rel="friend nofollow ugc">Fee Themes</a> and <a href="https://fancythemes.com/wordpress-plugins/" rel="friend nofollow ugc">plugins</a></li>
</ul>

Advanced Excerpt

Control the appearance of WordPress post excerpts

Vacant Line BReaker vs Advanced Excerpt