mnmlthms

If you are looking for a plugin that help you to create unlimited sidebars for pages/posts/taxonomies… without coding skills, WP Custom Sidebars is what you’re looking for!.
Easily overriding sidebar positions on your site, no integration needed. Works with any WordPress theme.
Features:
<ul>
<li>Override any sidebars on your site.</li>
<li>Support Post types, Category, Tags or Custom Taxonomies.</li>
<li>Adding as many sidebars as you want.</li>
<li>Transferable/Importable sidebar data.</li>
<li>Translation ready with mo/po files.</li>
</ul>
Note that if you are using other custom sidebar plugins, you should disable them so WP Custom Sidebars won’t be confused on overriding sidebars 😀
How to use WP Custom Sidebars?
<ul>
<li>Step 1: Select post types you want to support custom sidebars in Appearance -> Sidebars -> General Settings tab.</li>
<li>Step 2: Create as many sidebars as you want. Then go to Appearance -> Widgets and add widgets to your sidebar you’ve just created.</li>
<li>Step 3: Go edit page/post or category/tag/custom taxonomies, then look for WP Custom Sidebars setting box, and overriding sidebars.</li>
</ul>
That’s it!
<h3>Arbitrary section</h3>

WP Custom Sidebars

Create unlimited sidebars for pages/posts easily without writing a single line of code!

Gregor Capuder

ProteusThemes

Primoz Cigler

<a href="https://codeship.com/projects/164619" rel="nofollow ugc"> </a>
Replace the theme default sidebars with your newly created sidebars.
This plugin was forked from the <a href="https://wordpress.org/plugins/custom-sidebars/" rel="ugc">Custom Sidebars plugin</a>, which we used for a few years, but their plugin development stalled, so we were forced to create this plugin. We really appreciate the work of developers of the original plugin!
This plugin allows you to create your own custom sidebars, configure them by adding widgets, and replace the default sidebars on posts or pages you want in just few clicks.
Here is the tl;dr list of the differences from original source:
<ul>
<li>Compatibility with the latest stable PHP version (namely PHP 7.0+).</li>
<li>Removed the “archive pages” functionality – replacing the custom sidebars on archive pages is not possible (e.g. on certain categories).</li>
<li>Open-sourced development on <a href="https://github.com/proteusthemes/custom-sidebars-by-proteusthemes" rel="nofollow ugc">GitHub</a>. Issue reports and pull requests welcome!</li>
<li>Covered with PHP unit tests.</li>
<li>Fixed couple of JavaScript errors.</li>
<li>Removed WP admin pointer.</li>
<li>Modern workflow with Grunt and Bower.</li>
<li>Removed heavy advertising.</li>
</ul>
<h3>Contact and Credits</h3>
This plugin is being developed by <a href="https://www.proteusthemes.com/" rel="nofollow ugc">ProtuesThemes</a>.
The original plugin: Custom sidebars is maintained and developed by <a href="http://premium.wpmudev.org" rel="nofollow ugc">WPMU DEV</a>. Original development completed by <a href="http://marquex.es/" rel="nofollow ugc">Javier Marquez</a>.

Custom Sidebars by ProteusThemes

Allows you to create custom sidebars. Replace sidebars for specific posts and pages.

WP Custom Sidebars vs Custom Sidebars by ProteusThemes