nimamir

This plugin adds shortcode to show a single product of the woocommerce in the place you put it. 
use it as [a_product id=x] where x is the id of your product
SingleProduct plugin 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 
any later version.
SingleProduct plugin 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 SingleProduct plugin . see GPL 2 license for more info at: https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
usage
after plugin activation,use it as [add_to_cart2 id=x] where x is the id of your product

SingleProduct

This plugin adds shortcode to show a single product of the woocommerce in the place you put it. use it as [a_product id=x] where x is the id of your p …

zevdesigns

This plugin was created to show the categories for a single post in the sidebar.
The categories will be displayed in an unordered list.
You can choose the title for the widget in the sidebar if you wish.
If you’re using the plugin, please drop the link to your blog <a href="https://wordpress.org/support/topic/plugin-posts-categories-in-sidebar-using-this-widget" rel="ugc">here</a>.
Example:
<pre><code><li id="cz_post_cat-3" class="widget-container widget_cz_post_cat">
 <h3 class="widget-title">Topics</h3>
 <div class="cz-post-cats">
 <ul class="cz-cat-ul">
 <li class="cz-cat-li"><a href="http://xxx.xxx.xxx/topic/facebook/">Facebook</a></li>
 <li class="cz-cat-li"><a href="http://xxx.xxx.xxx/topic/jobs/">Jobs</a></li>
 </ul>
 </div>
</li>
</code></pre>
It uses the <code>is_single()</code> query in php so that it ONLY shows up on single posts. Not pages.
<h3>Arbitrary section</h3>
Anyone need any info here?

Post’s Categories in Sidebar

Displays the categories for a single post in the sidebar.

SingleProduct vs Post’s Categories in Sidebar