Hinaloe

<blockquote>
You no longer have to use this plugin because it was merged to <a href="https://ja.wordpress.org/plugins/public-post-preview/" rel="nofollow ugc">PPP plugin</a> at v2.6.0.
</blockquote>
This plugin send <code>Cache-Control: no-cache, must-revalidate</code> header when show <a href="https://wordpress.org/plugins/public-post-preview/" rel="ugc">public-post-preview</a> post.
In other word, that make skip cache of CDN (like CloudFlare, CloudFront… and other), or Proxy-Cache (Like Nginx). 
So, outside people always can see newest draft, and there is no need extra time to close public draft.
This plugin needs PHP 5.3+
Note: If you’re using CloudFront, you should also use <a href="https://wordpress.org/plugins/c3-cloudfront-clear-cache/" rel="ugc">C3 Cloudfront Cache Controller</a>

Non Cache Public Post Preview

Disable cache when show public post preview post

Nagmay

Let anonymous users preview a post before it is published!
Have you ever been writing a post that needs to be reviewed by someone who does not have access to log in? This plugin generates a simple URL that can be given out for public preview.
Based on Public Post Preview 1.3 by Matt Martz and Jonathan Dingman. Unlike Public Post Preview, the Simple Preview can be accessed by more then one user. The 24hr time limit has also been removed.
<h3>Upgrading</h3>
<ol>
<li>Click update from the WordPress plugin menu.</li>
</ol>
or
<ol>
<li>
Click ‘Download’ on this page.
</li>
<li>
Deactivate the simple preview plugin through the Plugins menu in WordPress Admin.
</li>
<li>
Upload the folder to your /wp-content/plugins directory, overwriting the previous version.
</li>
</ol>

Simple Preview

Let anonymous users preview a post before it is published!

Non Cache Public Post Preview vs Simple Preview