carlosfazenda

With one click, this plugin can create a replica or clone of a post or page. Now you don’t need to do the styling of a new page or post from scratch.
Major features of this plugin include:
<ul>
<li>Create a page clone preserving all the content and title</li>
<li>Create a post clone preserving all the content and title</li>
</ul>
How to Use and Install
<pre><code>* Install and Activate the plugin
* To clone pages just go to all pages on your dashboard and then hover cursor over a page and click on "Clone" option. After that, you will be redirected to the draft copy, make the changes you wish and hit publish.
* To clone posts just go to all posts on your dashboard and then hover cursor over a post and click on "Clone" option. After that, you will be redirected to the draft copy, make the changes you wish and hit publish.
</code></pre>
About
<pre><code>Please consider to make a donation at https://www.paypal.me/carlosfazenda/10 This plugin is maintained by http://carlosfazenda.com
</code></pre>

Page and Post Clone

Page and Post Clone plugin creates a clone of a page or post with the same content as the original.

Shail Mehta

This Plugin is use for create functionality to duplicate any post / all post types, including taxonomies & custom fields
Primary Features 
* Very easy to create duplicate post or duplicate custom post 
* This plugin is free

sm post duplicator

This Plugin is use for create duplicate post or duplicate custom post

Page and Post Clone vs sm post duplicator