Tom McFarlin

Find Missing More Tags scans your posts and identifies which ones are missing the <code></code> tag. This helps ensure consistent formatting across your blog, where the more tag controls how much content appears in archive pages and feeds.
Features:
<ul>
<li>Scans all posts (published, draft, pending, scheduled, private)</li>
<li>Works with both Classic Editor and Block Editor more tags</li>
<li>Clean, modern admin interface with card-based design</li>
<li>Three organized tabs: missing, has tag, and ignored</li>
<li>Ignore posts that intentionally skip the more tag</li>
<li>Quick edit links that open in a new tab</li>
<li>Paginated results for sites with many posts</li>
<li>No settings required – smart defaults work out of the box</li>
</ul>
Why use the more tag?
The more tag (<code></code>) creates a clean break in your content, showing only an excerpt on archive pages with a “Read More” link. Without it, your archive pages might show full posts or rely on automatic excerpts that can cut off mid-sentence.

Find Missing More Tags

Helps content editors identify posts missing the more tag, making it easy to find and edit them.

loveless

Provides hooks that can be used within ‘The Loop’ to grab content from before and after the  tag. If no MORE tag is provided, it will return <code>the_excerpt()</code> and <code>the_content()</code> respectively. You can also use a function to access all content, regardless of MORE tag.
<h3>Current version</h3>
Current version: 1.2
<h3>Revision History</h3>
0.1 – made within the functions.php file of the theme 
0.5 – created the plugin, still required $post->post_content to be passed to functions 
1.0 – removed $post->post_content to be passed in. 
1.1 – fixed a bug that stopped <code>the_content()</code> from posting 
1.2 – added function to get all post content, regardless of MORE tag
<h3>GPL</h3>
Copyright 2008 Corey Dutson (email : cdutson@wallofscribbles.com)
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

PostDivider

Allows the user to select text before and after the MORE tag using custom hooks.

Find Missing More Tags vs PostDivider