Philip Newcomer

This plugin makes all custom fields (post meta) visible in the “Custom Fields” meta box on post edit screens.

Show Hidden Post Meta

As a plugin developer, I create hidden post meta all the time and sometimes I need to see it to debug it. This does what it says it does, and well. Its simple and hasn't been updated for a while, but I'm glad it exists!

PS: If you need someone to take this one over, let me know. I'll keep it tested and updated if you're unable to.

Still works on 5.5

Makes hidden post meta visible on post edit screens

Hesham Zebida

This plugin allows you to transfer your inputs Schema markups for reviews and star ratings for Rich Snippets data from one theme/plugin to another. We all know how difficult it can be to switch between platforms. This plugin remedies that.
Just choose what platform your moving away from, platform you want to move to. Click “analyze” to see what records and elements are compatible, and click “convert” to make the conversion.
This plugin was created to mainly assist <a href="https://wprichsnippets.com/" rel="nofollow ugc">WPRichSnippets</a> plugin users to transfer their site data.
Supported Themes
<ul>
<li>None.</li>
</ul>
Supported Plugins
<ul>
<li>Author hReview</li>
<li>WP Reviews</li>
<li>WPRichSnippets</li>
</ul>

WPRS Data Transporter

Simply transfer your inputs Schema markups for reviews and star ratings data from one theme/plugin to another.

Show Hidden Post Meta vs WPRS Data Transporter