Mikko Virenius

This WordPress Plugin allows an admin user to add comments even if the comment thread is closed.
Features
<ul>
<li>No options panel</li>
<li>No extra configuration required</li>
</ul>

Admin Can Always Comment

I use this on CSS-Tricks for the obvious reasons. I close comments after a certain amount of time, but as an admin, I want to be able to leave comments whenever I want to. 

Works Great with 4.9.6

This plugin allows an admin user to add comments even if the comment thread is closed.

Janos Ver

This plugin will enable you to
<ul>
<li>
Create Reading Groups and associate them with users and private posts and private pages
</li>
<li>
Once these users logged in they will see those private posts and private pages which you granted access to
</li>
<li>
Publish your posts and pages to general public as usual
</li>
</ul>
Your users will not be aware (unless you tell them) of what Reading Groups they are part of (if any).
Translations
<ul>
<li>
Hungarian – Janos Ver (last updated for plugin v1.9)
</li>
<li>
Czech – TomKom (last updated for plugin v1.9)
</li>
</ul>

WP JV Post Reading Groups

Thank you. Your work really saved me a lot of time. Thanks again

Very good

Easily create posts and pages visible only for selected users of your blog

Admin Can Always Comment vs WP JV Post Reading Groups