Fred Dessaint

Epitome Subtitle adds a subtitle field in the edit page of a regular post and static page. Note that a small coding is required to display the subtitle in the right location of your template. You provide to your theme the ability to display a title and a subtitle using functions that you call from your template.
<h4>Functions</h4>
<ul>
<li><code>the_subtitle()</code> takes the current post or page ID and outputs the subtitle.</li>
<li><code>get_the_subtitle($post_id)</code> has one optional parameter (post or page ID) and returns the subtitle as a string.</li>
<li><code>has_post_subtitle($post_id)</code> has one optional parameter (post or page ID) and checks whether a subtitle exists.</li>
</ul>

Epitome Subtitle

Add a subtitle to regular post and static you display with a set of functions from your template.

Mostafa Shahiri

The Small Heading For Post Title is a simple plugin for displaying subtitles before or after post title. It is a useful plugin for the websites 
such as news websites that display some small headlines or captions before or after the main title. This plugin adds a meta box to your page/post forms 
in admin panel and you can determine a custom text as the subtitle and position of the text, then it will be shown before or after the post title based 
on your choice.
Also, in settings page of this plugin, you can add some CSS codes for styling the subtitles and you can determine and control that subtitles 
are shown in which sections of WordPress (See screenshot images).

Small Heading For Post Title

The Small Heading For Post Title is a simple plugin for displaying small headings (subtitles) before or after post title.

Epitome Subtitle vs Small Heading For Post Title